Question

3) Calcule: Cos 1° + cos 2° + cos 3° +……..+ cos 178° + cos 179° + cos 180°

Answer 1

Answer:

2567789990099999999999999999999999999999

Answer 2

Answer:

-1

Step-by-step explanation:

as cos is negative in the 2nd quadrant

therefore, cos values from 91 degree to 179

will cancel values from 1 to 90 degrees

and addup to 0

therefore , ans =cos 180 degree

hence, ans=-1

hope it helps you