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(cos 3 A - 2cos 4 A )/ (sin3A+ 2sin4A) when A=15
(cos 3*15- 2cos 4*15)/ (sin3*15+ 2sin4*15)
(cos 45- 2cos 60)/(sin45+ 2sin60)
(1/root2- 2*1/2)/ (1/root2+2*root3/2)
(1/root2-1) /(1/root2+root 3)
{(1-root2)/root2}/{(1+root3)/root2}
(1-root2)/(1+root3).....ans....
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