Math, asked by ashmirawat7, 8 months ago

cos 20 degree + cos hundred degree + cos 140 degrees equal to cos 90 degree​

Answers

Answered by magicdoll27
0

Answer:

cos20+cos100=2cos(100+20)/ 2cos(100-20)/2 ... cos20+cos100+cos140=cos40 + cos140 =2cos(40+140)/2cos(40-140)/2 = 2cos90cos50 =2*0* ... =2*cos 140+20/2*cos 140-20 /2+cos100°.

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