Q30 of 48 Page 84

Prove the following with the help of identities:

then prove that (m2 + n2) cos2B = n2

Taking L.H.S we get,


()cos2 B


⇒ × cos2 B


⇒


= = n2


= R.H.S


Hence, proved.


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Prove the following with the help of identities:

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(i)


(ii)


(iii)


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(iii)


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