Trigonometry

Simplify the expression: (1 - cos 2A) / sin 2A.

The value of sin 15° is:

What is the formula for cos(A - B)?

Express tan 2A in terms of tan A.

Simplify: sin(45° + θ) - cos(45° - θ).

Find the value of tan 75°.

If sin A = 1/2, then the value of sin 3A is:

What is the value of 1 + tan² A?

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

Which formula represents cos 3A?

What is the value of tan(45° - A) if tan A = 1/3?

In a triangle ABC, if A + B + C = 180°, then sin(A + B) is equal to:

Convert sin 2A in terms of tan A.

Simplify: sin A cos A cos 2A.

Express cos 2A in terms of tan A.

Find the value of cos² 15° - sin² 15°.

If A + B = 45°, what is (1 + tan A)(1 + tan B)?

What is the value of 1 - 2 sin² 22.5°?

Evaluate: cos 10° cos 20° - sin 10° sin 20°.

Simplify: tan θ + cot θ.