Math, asked by btzamareesh, 4 months ago

prove that cos4A=8cos⁴A-Acos²A+1+1

Answers

Answered by suchigupta503

0

Step-by-step explanation:

ANSWER

L.H.S=cos4A=cos2(2A)

=2cos

2

2A−1

=2(2cos

2

A−1)

2

−1

=2(4cos

4

A+1−4cos

2

A)−1

=8cos

4

A+2−8cos

2

A−1

=8cos

4

A−8cos

2

A−1=R.H.S

Hence proved.

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