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OpenStudy (anonymous):
fill in the blank sin a ____ =1/2 (sin(a+b)+sin(a-b)) options: A)sin a B)sin b C)cos b D)cos a
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OpenStudy (anonymous):
please help! :)
OpenStudy (anonymous):
cos b
OpenStudy (anonymous):
sin(a+b)+sin(a-b)=(sin a*cos b+sin b*cos a)+(sin a*cos b-sin b*cos a)=2*sin a*cos b
OpenStudy (anonymous):
thank you
OpenStudy (anonymous):
can you give me a gold medal?
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