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OpenStudy (anonymous):
sina = 4/5 and cos b = -12/13 what is cos(a+b).?
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OpenStudy (anonymous):
cos(a+b). = cosa cosb - sina sinb
OpenStudy (anonymous):
there are 4 multiply choice answers and they are : -16/65 -56/65 16/65 56/65 but i dont know how they got it! @Yahoo! i know that step! thanks !! i dont know after that
OpenStudy (anonymous):
it is just a formula
OpenStudy (anonymous):
but do we hve to change it to degrees?
OpenStudy (anonymous):
|dw:1345471251256:dw|
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