- #1
moe darklight
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?? I don't understand this answer
The pdf attached is the answer to a question from a Calculus quiz. (the right hand side is a bit cut off, but the formula is repeated further down)
Edit: the "f(x) = ..., and a=0" part is the solution, not part of the the question.
ok. I have no idea what she's doing here. when I do the derivative of the f(x) she gives as the answer, I get
1/2 (1+3cosx)^1/2 is
1/4 ((1+3cosx)^-1/2)(-3sinx) = -3sinx / 4 sqrt(1+3cosx)
which is not even close to the original f'(x) she posted...
can anyone show me how she got that answer? thanks.
Homework Statement
The pdf attached is the answer to a question from a Calculus quiz. (the right hand side is a bit cut off, but the formula is repeated further down)
Edit: the "f(x) = ..., and a=0" part is the solution, not part of the the question.
Homework Equations
The Attempt at a Solution
ok. I have no idea what she's doing here. when I do the derivative of the f(x) she gives as the answer, I get
1/2 (1+3cosx)^1/2 is
1/4 ((1+3cosx)^-1/2)(-3sinx) = -3sinx / 4 sqrt(1+3cosx)
which is not even close to the original f'(x) she posted...
can anyone show me how she got that answer? thanks.
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