Question

cos 1°+ cos2° + cos 3° +... + cos 179° =?

Answer 1

Hey sreejeth
your answer is here

we know that cos(180-A) = -cosA

so cos1° = -cos179°

similarly
cos2° = -cos178°
.
.
.
.
and finally cos90° left
and cos90° = 0

so,your answer is zero

Hope this help you

Thanks

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Answer 2

it will surely help you don't worry