cos 20 cos 40 Cos 60 cos 8 is equal to 1 by 16 prove them
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it is cos80
then we solve divide by 2 and multiply by 2
then 2cosA cosB=cos[A+B)+cos(A-b)
then we solve divide by 2 and multiply by 2
then 2cosA cosB=cos[A+B)+cos(A-b)
shivampant:
how i cant understand it
i can't understand it
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