يمكن الحساب باستخدام
put
then
solve for cos x using eq uation solver you will get 5 answers take the greatest of them
اقتباس :
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cos 12 = - 1/8+sqrt 5 /8 +1/2*sqrt(15/8+3*sqrt5 /8 )
يمكن الحساب باستخدام
cos 5x=16 cos^5 x - 20 cos ^3 x + 5cos x
put cos5 x =1/2
then
solve for cos x using eq uation solver you will get 5 answers take the greatest of them
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