Simplify cos^4 x + 2cos^2 x sin^2 x + sin^4 x
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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.
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. =/
Originally Posted by acherucheril still confused. =/ your expression is a perfect square trinomial ... factor it.
Originally Posted by acherucheril still confused. =/ Your expression is of the form: $\displaystyle a^2+2ab+b^2$ Ring any bells??
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