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Write the value of cos1^0+cos2^0+cos3^0+...

Write the value of `cos1^0+cos2^0+cos3^0++cos 180^0dot`

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We know that
`cos(180-theta)=-costheta`
`cos(180-theta)+cos(theta)=0`
For all `theta` satisfying above equation is zero.
...
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