# StudySquare

# AQA A-level Maths Trigonometric Identities

This page covers the following topics:

1. Trig identity and it’s applications (1)

2. Trig identity and it’s applications (2)

3. Applications of trigonometric identities

We can use both Pythagorean identities to solve algebra and geometry problems.

# 1

Find the value of tanx, given that cosx = −0.7 and x is in the 2nd quadrant. Give your answer correct to two decimal places.

# 2

Solve 2sinx = cosx for 0 < x < 90 correct to 1 decimal place.

# 3

Simplify cos²(x) + cos²(x)tan²(x).

# 4

Prove 2sin²(x) − 2 = −2cos²(x).

# 5

Simplify the equation shown.

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