Subject: trig functions
Name: melissa
Question: I think i should graph it but can't figure out how to enter cos^{2}x into my calculator. Also, can this be used with the quadratic formula? i have no clue what I'm doing. Hi Melissa,For either the graphic solution or the algebraic solution it is important to realize that cos^{2}x = (cos x)(cos x) = (cos x)^{2}. To enter cos^{2}x into your calculator, calculate cos x and square it. For an algebraic solution write y = cos x and then the equation becomes 2 y^{2}  3 y  4 = 0. Cheers,Paul and Harley
