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Edexcel C3 Exercise 6D, Question 6c - Help

Prove the following identity:

(sec^2 x)(cot^2 x - cos^2 x) = cot^2 x
What have you done so far? post some working please :smile:
Reply 2
Lots of different ways

Think what sec^2x is...... perhaps then mutiply through the brackets with the sec^2x on the LHS and see what happens...thats one way to show it

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