# Trigonometric equations Questions and Answers

Math

Trigonometric equationsConsider the curve: y = 1-csc(2 (x-π))
(a) State the period of this curve.
(b) State the phase shift of this curve, and whether it is to the right or to the left.
(c) Sketch a sequence of 5 small separate graphs carefully labeled over a single period starting with y = sin(x) for x ∈[0,2π], moving one change at a time through 3 intermediate curves, and ending with the curve above, as we have done in class.

Math

Trigonometric equations12-35. For each of the following equations, list all of the solutions without using a calculator. Use the unit circle or a graph to check your answer. Then, predict the solution that your calculator will give, and use your calculator to check your prediction. a. 2cos(x) - 1 = 0 b. 4sin²(x) - 3 = 0 c. 2sin(x) = √3

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Trigonometric equationsSalina, Tamara, and Uma are working on their homework together. Salina tells her friends that she has θ = 52° for the inverse cosine problem she is working on and asks if they have the same answer. Tamara says she has θ = 128°, and Uma volunteers her answer of θ = 308°. Is it possible that these are all solutions to the same problem? Justify your answer.

Math

Trigonometric equationsSuppose sin(a)= 7/10, where 0 ≤ a ≤ π/2
Find all solutions in [0, 2π):
sin(2x) = 7/10

Math

Trigonometric equationsSolve the following equation for all radian solutions and if 0 < t <2π. Give all answers as exact values in radians. Do not use a calculator. list. If there is no solution, enter NO SOLUTION.)
3 cos t = 9 cost t-3√3
(a) all radian solutions (Let k be any integer.)
t=rad
(b) 0≤t <2n
t= rad

Math

Trigonometric equationsGiven the trigonometric function defined by f(x) = cos(4x):
1. What is the amplitude of the function? _______
2. What is the period of the function? ______
3. Sketch one period of the function.

Math

Trigonometric equationsLet the trigonometric function f be defined as f(x)= -2sin(9x),
The amplitude of f is _____
The period of f is ____
The y-intercept is ____

Math

Trigonometric equationsWhich expression below can be obtained from 10sin²x by using a power reducing formula?
Select the correct answer below:
5 - 10cos (5x)
5-5cos (2x)
10-5cos (2x)
5-10cos (x)
5-5cos (x)

Math

Trigonometric equationsFor sin 2x + cos x = 0, use a double-angle or half-angle formula to simplify the equation and then find all solutions of the equation in the interval [0, 2π).
The answers are
x1 =
12
x3 =
x4 =

Math

Trigonometric equationsGiven: tanx = -15/8 and x is in Quadrant IV.
Find the exact values of sin (x/2),cos (x/2), and tan (x/2) without solving for x, when 0 ≤ x ≤ 360°.
To enter the square root of a number, type "sqrt(a)". For example, type "sqrt(2)" to enter √2.
a)sin (x/2)= ___
b)cos (x/2)= ___
c)tan (x/2)= ___

Math

Trigonometric equationsLet P(x, y) be the terminal point on the unit circle determined by t. Then sin(t) = ___,
cos(t) = ___ , and tan(t) = ___.

Math

Trigonometric equationsEvaluating the cosine of a sum of two angles can be done using cos(A + B) = ?
a) sin(A) sin(B) – cos(A) cos(B)
b) None of these
c) cos(A) cos(B) + sin(A) sin(B)
d) cos(A) cos(B) – sin(A) sin(B)

Math

Trigonometric equationsSolve the following equation on the interval [0°, 360°). Round answers to the nearest tenth. If there is no solution, indicate "No Solution."
-6csc²(x) - 19cot(x) = 4

Math

Trigonometric equationsExpress the following function as a purely algebraic function.
sec(cos-¹(3x))