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Abhishek Mishra

2 years ago

do learn these formulas the will help you to solve doubts of trigo.

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Aanjney Singh

2 years ago

Question->sin2A=2sinA.cosA;;if A=45° Answer-> L.H.S-> sin2A=sin2×45°=sin90°=1(L.H.S) R H.S-> 2sinA.cosA=2sin45°.cos45° since-> sin45° & cos45° both equals to 1/√2 thus-> 2sin45°.cos45°=2×(1/√2)×(1/√2) =2×(1/2)=1(one). L.H.S=R.H.S. (Proved)✓✓

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