# C3 Trigonometric Identities

Flashcards by Sarah H-V, updated more than 1 year ago
 Created by Sarah H-V over 6 years ago
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### Description

A Levels Maths Flashcards on C3 Trigonometric Identities, created by Sarah H-V on 02/02/2015.

## Resource summary

 Question Answer sin ( A + B ) sinA cosB - sinB cosA sin ( A - B ) sinA cosB + sinB cosA cos ( A + B ) cosA cosB - sinA sinB cos ( A - B ) cosA cosB - sinA sinB tan ( A + B ) identity involving sin ^2 and cos ^2 sin ^2 x + cos ^2 x = 1 identity involving tan ^2 and sec ^2 tan ^2 x + 1 = sec ^2 x identity involving cot ^2 and cosec ^2 1 + cot ^2 x = cosec ^2 x sin 2A 2 sinA sinB cos 2A cos ^2 A - sin ^2 A or 1 - 2 sin ^2 A or 2 cos ^2 A - 1 tan 2A

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