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Prove the identity. 4 cos 40 - 4 sin 40 = 4 cos 20
To verify the identity, start with the left side and transform it to obtain the right side. Choose the correct stop and trans
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Answer #1

soln :- given, 4 costo-Asino = 4 cosao L.H. 3 = 4l costo - sinto) 4 1 kos²0)²-(sin 2012) = 41(co 5²0 - sin?) (cos²0+ sin²o)}

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