Skip to content
A Level
Find course
Features
Quick links
Open app
A Level
Maths AQA
Question bank
1.8.8 Proofs with trigonometric identities
Easy
Medium
Hard
1
2
3
4
Question 4
Formula sheet
Calculator
Highlight
Mark as complete
Markscheme
Prove the identity:
cos2xcosx+sinx≡cosx−sinx \frac{\cos 2x}{\cos x + \sin x} \equiv \cos x - \sin x
cos
x
+
sin
x
cos
2
x
≡
cos
x
−
sin
x
[2]
Write your answer here...
Markscheme
Ask Genie
3
Grade answer
Ask me anything!
1.8.8 Proofs with trigonometric identities Questions
A Level
/
Maths
/
1.8.8 Proofs with trigonometric identities
