Question: I need help understanding how to solve this problem Find the derivative of : 9 sin2( 6:137) . Hint: sin2(a:) = [sin(a:)]2...so use the chain

I need help understanding how to solve this problem
![derivative of : 9 sin2( 6:137) . Hint: sin2(a:) = [sin(a:)]2...so use](https://s3.amazonaws.com/si.experts.images/answers/2024/06/66738e610a7da_10766738e535d345.jpg)
Find the derivative of : 9 sin2( 6:137) . Hint: sin2(a:) = [sin(a:)]2...so use the chain rule (twice!)
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