Question

Prove that : ( 1 – sin2 )sec2 = 1.
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Answer 1

Answer:

(1 - sin^2)sec^2

= (cos^2) sec^2 ______(sin^2 +cos^2=1)

= cos^2 × 1/cos^2 _______(sec^2 = 1/cos^2)

= 1

hence proofed!!!!!