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OpenStudy (anonymous):
cos 100 cos 80 - sin 10 sin 80
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rvc (rvc):
do you know the trigonometric formulas?
rvc (rvc):
like sin(A+B)...
OpenStudy (er.mohd.amir):
use one of this sin (x+y) ,sin (x-y) ,cos (x+y) , cos (x-y) among four of this formulas one equivalent to your problem and remember all this formulas for future use.
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