Hi friends
Can some one explain me from the 2nd step tht how
cos²ø- sin²ø became 2cos² - 1 nd the following step 1-2sin²ø
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Plz mark as the brainliest answer
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Hiii mam ji
if u use identity sin^2x=1-cos^2x
u will get 2cos^2x-1
if u will use identiry cos^2x=1-sin^2x
u will get the 2nd relation
if u use identity sin^2x=1-cos^2x
u will get 2cos^2x-1
if u will use identiry cos^2x=1-sin^2x
u will get the 2nd relation
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