sin 10 + sin 20 +sin 40 + sin 50 = 2Cos 15× cos 5
Prove that LHS =RHS
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Answer:
Sin10+sin20 + sin40 + sin 50
= - 0.54+0.91+0.74+(-0.26)
= 0.85 ... condition 1
2cos15×cos5
= - 1.51×0.28
= - 0.42 ... Condition 2
From condition 1 and 2
LHS is not equal to RHS
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