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cot 4x (sin 5x + sin 3x) = cot x (sin 5x-sin 3x) |
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Answer» LHS=cot4x (sin5x+sin3x)=cot4x.2sin4x.cosx=2(cos4x/sin4x)sin4x. cosx=2co4x.cosx=2cos4x. sinx.cotx=cotx(2sinx.cos4x)=cotx(sin5x-sin3x)=RHS |
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