Question Bank

The value of cos^2(15) - sin^2(15) is:

Simplify cos(A - B) - cos(A + B).

What is the value of tan(15)?

If sin A = 1/sqrt(2), find cos(2A).

The expression 2 cos^2(theta/2) - 1 is equal to:

What is 1 - 2 sin^2(22.5) equal to?

Simplify sin(3A) / sin A - cos(3A) / cos A.

If A + B = 45, then (1 + tan A)(1 + tan B) = ?

The value of cos 20 cos 40 cos 80 is:

Simplify 3 sin A - 4 sin^3 A.

What is cos(A+B)cos(A-B)?

If cos A = 4/5, find tan(A/2).

Simplify: sin(A+B)sin(A-B).

Value of tan 75 + cot 75 is:

The expression 4 cos^3 A - 3 cos A equals:

Simplify cos(60+A) + cos(60-A).

If tan A = x, then sin 2A is:

If A + B + C = 180, then tan A + tan B + tan C is equal to:

Solve: sin 10 sin 30 sin 50 sin 70

If A+B+C = 180, then cos 2A + cos 2B + cos 2C = ?