SOLUTION: evaluate 2tan^2(300 degrees)+3sin^2(150 degrees)-cos^2(180 degrees)

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Question 1044121: evaluate 2tan^2(300 degrees)+3sin^2(150 degrees)-cos^2(180 degrees)
Answer by advanced_Learner(501) About Me  (Show Source):
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evaluate 2tan%5E2%28300%29%2B3sin%5E2%28150%29-cos%5E2%28180%29
tanx=%28sinx%29%2F%28cosx%29
sin300=-sin60=-sqrt%283%29%2F%282%29
cos300=cos60=%281%29%2F%282%29
cos180=-1
sin150=sin30=0.5

2tan%5E2%28300%29%2B3sin%5E2%28150%29-cos%5E2%28180%29
2%28sin%5E2%28300%29%29%2F%28cos%5E2%28300%29%29%2B3sin%5E2%28150%29-cos%5E2%28180%29

5.75
as fraction
23%2F4