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Mathematics 10 Online
OpenStudy (anonymous):

Help, find exact value of cos(-7pi/12)??

OpenStudy (anonymous):

I got (sqrt6 +sqrt2)/4

OpenStudy (anonymous):

I don't think it's right

OpenStudy (cwrw238):

you could do it this way cos -7pi/12 = - cos75 degrees and use the compound angle formula cos 75 = cos(30 + 45) = cos45cos30-sin45sin30

OpenStudy (anonymous):

That confuse me what? @cwrw238

OpenStudy (anonymous):

What would you get if you did the problem ?

OpenStudy (cwrw238):

|dw:1376509222033:dw|

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