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OpenStudy (anonymous):
can anyone explain some trigonometry for me? mainly how to do this: a)Use a sum or difference formula to calculate the exact value of sin( pi/12 ). b) Use part a) to determine the exact value of cos(5pi/12 ).
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OpenStudy (anonymous):
pi/12=pi/3-pi/4 now use it
OpenStudy (anonymous):
i must be tired...
OpenStudy (anonymous):
cos(5pi/2)=cos(pi/2-pi/12)=sin(pi/12)
OpenStudy (anonymous):
sin pi/3 cos pi/4 - cos pi/3 sin pi/4
OpenStudy (anonymous):
yes
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