Asked by Ashleigh
6cos^2(x)-5cos(x)-6
Answers
Answered by
Steve
just for readability, suppose u = cosx
Then you have
6u^2-5u-6=0
(3u+2)(2u-3)
that means
cosx = -2/3
cosx = 3/2
I guess you can take it from there, ok?
Then you have
6u^2-5u-6=0
(3u+2)(2u-3)
that means
cosx = -2/3
cosx = 3/2
I guess you can take it from there, ok?
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