sin2x sinx+cos6x sin3x/sin2x sinx +sin6x cosx = cot5x
Kindly refer the similar link for your query.
https://www.meritnation.com/ask-answer/question/prove-that-sinx-sin2x-sin3x-sin6x-sinx-cos2x/trigonometric-functions/10414461
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https://www.meritnation.com/ask-answer/question/prove-that-sinx-sin2x-sin3x-sin6x-sinx-cos2x/trigonometric-functions/10414461
Regards