Math, asked by abhi207, 1 year ago

prove that :- cos4 A - sin4 A + 1 = 2 cos2 A

Answers

Answered by Anonymous

5

=cos (2a+ 2a) - sin(2a+2a)+1
=cos2a cos2a - sin2a sin2a - sin2a cos2a-cos2a sin2a
=

abhi207: its raised to 4

Answered by sujaybs

0

Step-by-step explanation:

7. Prove the Identity: Sin4 A - Cos4 A = 1 – 2 cos 2A

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