Pre-Cal (verifying trig identities)
posted by Crystal on .
How would you verify the identity?
what is rad?
multiply both sides by the sqrt sinx
sinx-cosxsinx-sin^3x cosx=cos^3x sinx
Hmmm. This is telling me the identity does not exist, because sinx(1-2cosx) is not zero.
check my work. There has to be an error here, but I am certain this is (was ) leading somewhere.
I read your identity as
(sinx)^(1/2) - cosx - (sinx)^(5/2)*cosx = (cosx)^3 *(sinx)^(1/2)
I picked 30 degrees, and the
left side was NOT equal to the right side.
So the way you typed it, it is not an identity.
I think I have the same book as you Crystal... I have no clue how to solve this thing... :p