Find all solutions of the equation in the (o, 2pie) interval
2sin^2x=2 = cos x
I really need help with this one....I'm lost. (the ^2 means squared)
2007-11-25 13:49:42 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
If the second equal sign were real, there would be no answers, since a cos can never equal 2.
If it's supposed to be a + sign, use the fact that sin^2 = 1-cos^2 to get a quadratic equation in cos x. And you surely know how to solve quadratic equations. :)
2007-11-25 22:47:28 · answer #1 · answered by Curt Monash 7 · 0⤊ 0⤋
1st find 2sin, then square it. subtract x from both sides:
2sin^x=2=cos
subtract the cos from 2sin^
add or subtract the answer from 2 depending on the value
(i dont have a calculator w/me so i am not going to work it out.
P.S. dont mean to embarrass you but im only in algebra 1.
this is an easy question.
2007-11-25 21:58:19 · answer #2 · answered by vecchiocrew@sbcglobal.net 2 · 0⤊ 1⤋