# Trig functions..Simplifying....

• November 23rd 2007, 07:41 AM
aikenfan
Trig functions..Simplifying....
The equation given is right next to each number...all work under that is mine...I believe the first four should be correct, but I am having trouble from number 5-8...could someone please assist me?
http://i103.photobucket.com/albums/m...1919/11__2.jpg
• November 23rd 2007, 08:37 AM
TKHunny
5 & 6 are easily shown with the Pythagorean Identity.

In 5, there is a preponderance of sin(x), so solve for $\cos^{2}(x)\;=\;1\;-\;\sin^{2}(x)$ and substitute. You will be left with a bunch of sines that you can handle.

In 6, there is a preponderance of cos(x), so solve for $\sin^{2}(x)\;=\;1\;-\;\cos^{2}(x)$ and substitute. You will be left with a bunch of cosines that you can handle.