Apply the product rule:
; to find :
Rewrite the function to be differentiated:
Apply the quotient rule, which is:
and .
To find :
Let .
The derivative of sine is cosine:
Then, apply the chain rule. Multiply by :
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
The result of the chain rule is:
To find :
Let .
The derivative of cosine is negative sine:
Then, apply the chain rule. Multiply by :
The derivative of a constant times a function is the constant times the derivative of the function.
Apply the power rule: goes to
So, the result is:
The result of the chain rule is:
Now plug in to the quotient rule:
; to find :
Let .
The derivative of is itself.
Then, apply the chain rule. Multiply by :
Apply the power rule: goes to
The result of the chain rule is:
The result is:
Now simplify:
The answer is:
/ 3\ / 3\ / 2 \ \x / 2 \x / \7 + 7*tan (7*x)/*e + 3*x *e *tan(7*x)
/ 3\ / 2 / 2 \ / 2 \ / 3\ \ \x / \42*x *\1 + tan (7*x)/ + 98*\1 + tan (7*x)/*tan(7*x) + 3*x*\2 + 3*x /*tan(7*x)/*e
/ 3\ / / 6 3\ / 2 \ / 2 \ / 2 \ / 3\ 2 / 2 \ \ \x / \3*\2 + 9*x + 18*x /*tan(7*x) + 686*\1 + tan (7*x)/*\1 + 3*tan (7*x)/ + 63*x*\1 + tan (7*x)/*\2 + 3*x / + 882*x *\1 + tan (7*x)/*tan(7*x)/*e