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The value of `cos1^(@)" "cos2^(@)" "cos3^(@)` . . .`cos177^(@)" "cos178^(@)" "cos179^(@)` is

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The value of `cos1^(@)" "cos2^(@)" "cos3^(@)` . . .`cos177^(@)" "cos178^(@)" "cos179^(@)` is
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`cos1^(@).cos2^(@)..............cos178^(@).cos179^(@)`
`rArrcos90^(@)=0`
`rArr0` [0 will make while series0]
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