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OpenStudy (anonymous):
solve over 0
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jimthompson5910 (jim_thompson5910):
Hint: sin^2 = 1-cos^2
OpenStudy (anonymous):
with the 2 would it become 2-2cos^2x on the left?
jimthompson5910 (jim_thompson5910):
correct
jimthompson5910 (jim_thompson5910):
you now have this 2-2cos^2x = 3cosx+3
jimthompson5910 (jim_thompson5910):
if you let u = cos x, then u^2 = cos^2x
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jimthompson5910 (jim_thompson5910):
giving you 2 - 2u^2 = 3u + 3
jimthompson5910 (jim_thompson5910):
solve that for u, then use those solutions to find the solutions for x
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