# High School Trig

• April 17th 2010, 05:42 PM
acherucheril
High School Trig
Simplify

cos^4 x + 2cos^2 x sin^2 x + sin^4 x
• April 17th 2010, 05:45 PM
Debsta
Quote:

Originally Posted by acherucheril
Simplify

cos^4 x + 2cos^2 x sin^2 x + sin^4 x

Hint: Let cos^2 x = a and sin^2 x = b and see if that helps you think it out.
• April 17th 2010, 05:50 PM
acherucheril
Quote:

Originally Posted by Debsta
Hint: Let cos^2 x = a and sin^2 x = b and see if that helps you think it out.

still confused. =/
• April 17th 2010, 05:53 PM
skeeter
Quote:

Originally Posted by acherucheril
still confused. =/

your expression is a perfect square trinomial ... factor it.
• April 17th 2010, 05:54 PM
Debsta
Quote:

Originally Posted by acherucheril
still confused. =/

Your expression is of the form:
$a^2+2ab+b^2$
Ring any bells??