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The average value of sin2^@,sin4^@, sin6...

The average value of `sin2^@,sin4^@, sin6^@.........sin180^@` is `(i) 1/90 cos1^0 (ii) 1/90 sin1^0 (iii) 1/90cot1^0` (iv) none of these

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The correct Answer is:
`(cot1^(@))/(90)`
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