Math, asked by adityaarjunkusale4, 10 months ago

Please answer fast pleaseeeeeeeeeeeeeeeee

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Answers

Answered by sreyashiganguli09

1

Answer:

b)2cos^2A

Step-by-step explanation:

cos^4A-sin^4A+1

=(cos^2A+sin^2A)(cos^2A-sin^2A)+1

=1(cos^2A-sin^2A)+1

[using identity: sin^2A+cos^2A=1]

=(cos^2A-sin^2A)+(cos^2A+sin^2A)

=cos^2A-sin^2A+cos^2A+sin^2A

=2cos^2A

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