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Sin square 100+ cos square 100=??

Answer»

Answer:

Sin 100° = sin( 90°*1 +10°) = cos 10° Cos 100° + Cos 10° = 2COS ... Cos100=cos(180-80) =-cos80=-sin10 ... Sin100-sin10=2cos((100+10)/2)sin((100-10)/2).



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