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Trigonometry

Browse High School Trigonometry
Stars indicate particularly interesting answers or
good places to begin browsing.
Selected answers to common questions:
DeMoivre's theorem.
Volume of a tank.
 Solving a Periodic Function [3/31/1996]

Solve: sin2z = 5
 Solving a Quartic Polynomial using a Trig Substitution [12/27/2001]

I need help solving this system: y/sqrt(y^2+64) = (x+y)/25; x/sqrt(x^
2+64) = (x+y)/20.
 Solving a Trig Equation [3/11/1996]

(sin (alpa))/(alpha) = ?
 Solving a Trig Equation Using Sine of a Sum [08/20/2008]

How do I solve an equation like 4 cos x + 6 sin x = 5?
 Solving Right Triangles [03/25/1998]

How do you know when to use sin, cos, or tan when solving right
triangles?
 Solving the Law of Tangents for an Angle [12/18/2004]

Given the Law of Tangents, (a  b)/(a + b) = tan (A/2  B/2) / tan
(A/2 + B/2), express angle B in terms of a, b, and A.
 Solving Trig Equations with Newton's Method [06/16/2006]

How can I solve an equation like 3sin(x) = x + 1 for 0 < x < 2pi?
 Solving Trig Identities [12/31/2001]

Please can you help me prove this trig. identitity: Sin X Cot X = Cos X.
 Solving Trigonometric Equations in Radians [12/14/1997]

Solve for theta in radians to 2 decimals if 0 < theta < 2 pi tan
theta = 0.318.
 Solving Trig Problems [08/18/1997]

Find the value of Tan [(x+1)/(x1)]^(1) + Tan (x)^(1).
 Special Angles [01/18/2002]

Can you help me find the solution for theta?
 Spiral Inside a Hexagonal Room [09/03/2003]

Two walls meet at 120 degrees, and you have a piece of cardboard with
an angle of 137.5 degrees that you want to tilt until its sides are
snug against the wall. How do you find the angle of tilt?
 The Square Root of i [05/25/1997]

What is the square root of i?
 Square Roots of Complex Numbers [03/28/1999]

Devise at least two methods for finding the square root of (a+bi).
 Squares and Triangles: a Proof [8/23/1997]

Two points lie within or on the boundary of a square. Prove that the
length of at least one of the lines...
 Standard Angles [08/09/2001]

Why are 0, 30, 45, 60, and 90 degrees taken as standard angles in
trigonometry? Why can't we take some other angles?
 SteinerLehmus Theorem [01/28/1999]

I have a proof about an isosceles triangle that I just can't figure
out...
 Strategies for Proving Trigonometric Identities [05/19/2003]

How can I prove the identity (1sin)/(1+sin) = tan + 1/cos?
 Substituting to Simplify the Integral [08/04/2003]

What is the integral of tan^3 x * secx dx?
 Subtracting and Multiplying Sines of Angle Multiples [04/01/2010]

Using the trig identity for the difference of sines, Doctor Jacques helps a student prove
the equivalence of two trigonometric expressions involving angles that happen to be
multiples of each other.
 Subtraction of Trig Functions with a Phase Shift [09/14/2004]

How do you find the difference between two trigonometric functions
with the same frequency, but one is phase shifted by 120 degrees?
 Summation Formulas for Trigonometric Functions [04/24/2001]

How do you find the area under the curve of a trigonometric function
using the definition of a limit and not an approximation? Are there
summation formulas for trigonometric functions?
 Sum of Sine Series [07/17/2008]

Show that for any integer n >= 1, the sum from k = 1 to n of sin(kt)
is [cos(1/2t)  cos((n + 1/2)t)]/[2 sin(1/2t)].
 Sum of Sines of Arbitrary Amplitudes [01/19/2012]

A student seeks the general form for the sum of two sines of different amplitudes. To
combine them into a single sinusoid, Doctor Rick invokes some trigonometric identities
and basic operations.
 Surface Area of a Cone [06/18/1998]

What is the formula for the surface area of a cone?
 Surface Area of an Oblate Spheroid [06/02/1999]

Could you please give an example of solving for the surface area of an
oblate spheroid using the inverse hyperbolic sine function?
 Tan 90 [07/10/1998]

Why is tan 90 undefined?
 Tan, Cos, Sin [05/21/1999]

Please tell me about tan, sin, and cos. How do you know which one to use?
 Tangent [02/14/2003]

Is the trigonometric ratio tangent related to the tangent of a circle?
 Tangent and Secant [2/2/1995]

I need help with the following problem: tan b + cot b = sec b csc b
 Tangent Function and the Unit Circle [06/06/2002]

When demonstrating the tangent function on the unit circle, why does
the picture 'flip' when the angle passes through pi/2?
 Tangent of 90 Degrees [5/24/1996]

Why is the tangent of 90 degrees undefined?
 Tangent to Graph of y = e^x [10/09/2003]

On the graph of y = e^x is point Q with coordinates (b,a). The tangent
to Q makes an angle x with the xaxis. Why is it that tan(x) = a?
 Tan pi/8 [03/16/2002]

I must find the exact value of tan pi/8.
 Terminal Side [04/21/1997]

Find cos(A) if the point (2,3) is on the terminal side of A.
 Three Trig Problems [6/11/1996]

1) Find tan x if ((sin x)^2)/3 + ((cos x)^2)/7 = (sin(2x)+1)/10 2)
A = 20 deg. and B = 25 deg. Find the value of (1+tanA)(1+tanB).
3) Evaluate cos 36  cos 72.
 The Top of the Tower [07/20/2001]

Given a 300miletall tower on the earth, how far away from it can you go
before the top disappears below the horizon?
 Train in the Rain [11/21/1996]

Given a train moving in the rain, determine the actual velocity and
direction of the raindrops/the train from how raindrops appear on the
train windows.
 Transforming Trig Functions [05/08/2001]

Express 3 sin x + 5 cos x in terms of sin x so that the graph is the same
as the first equation.
 Translating Trig to Algebra; Proving Trig Identities [08/09/2002]

Write as algebraic expressions in x, free of trig or inverse trig
functions: sin(arccos x), tan(arcsin x), cos(arccot x), sec(arctan(x+
2)). Prove these identities: sec^2 x + csc^2 x = sec^2 x (csc^2 x);
sin^4 x + 2sin^2 x (cos^2 x) +cos^4 x = 1.
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