Homework Help: Math - Pre- Clac

Posted by Jonathan on Monday, December 14, 2009 at 9:08pm.

Prove that each of these equations is an identity.

A) (1 + sinx + cos x)/(1 + sinx + cosx)=(1 + cosx)/sinx

B) (1 + sinx + cosx)/(1 - sinx + cosx)= (1 + sin x)/cosx

Please and thankyou!

Math - Pre- Clac - Reiny, Monday, December 14, 2009 at 10:41pm
you must have a typo in A since the left side equals 1

for B
multiply the left side by (1+sinx-cosx)/(1+sinx-cosx)
which after collecting like terms, and reducing comes to the right side.
A key simplification is the sequence of terms
1 ....+sin^2x... - cos^2x

which reduces to 2sin^2x

I am sure a similar step will work for A) after you find your typo
Math - Pre- Clac - Jonathan, Monday, December 14, 2009 at 10:46pm
Ok thanks, I did make a typo my bad.

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