1. Which of the following is equal to cos⁴(40°) − sin⁴(40°)?
2. (sin⁴ θ − cos⁴ θ)/(sin² θ − cos² θ) = (a) (b) (c) (d) tan² θ (e) 1
sin⁻¹(sin(7π/6)), where −π/2 ≤ θ ≤ π/2, is:
If sin 37° = 0.6, then sin 74° equals:
Which of the following is cos⁴40° − sin⁴40°?
tan 18° + tan 27° + tan 18° × tan 27° =
If x + y = 90°, which of the following must be true? (a) (b) (c) (d) (e) tan x + cot y = 1
If sin A = 2/3 and cos A < 0, find the value of tan 2A.
If sin x + sin²x = 1, then cos⁸x + 2cos⁶x + cos⁴x =
Which of the following is equivalent to cos θ when 0 ≤ θ ≤ π?
The value of cos 10° × cos 20° − sin 10° × sin 20° is:
Expressed as a function of an acute angle, cos 310° + cos 190° =
f f(x, y) = tan x + tan y and g(x, y) = 1 − tan x × tan y, then f(π/12, π/6) / g(π/12, π/6) =
(tan 140° + tan 70°)/(1 − tan 140° × tan 70°) equals:
The area of △ABC is 24√3. If side a = 6 and side b = 16, then the angle C is:
In △ABC, if sin A = 1/3 and sin B = 1/4, then sin C equals:
√((1 + cot²x)/(1 + tan²x)) =
