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The value of (co s eca -sin a) (sec a- cos a) (tan a+ cot a) is:

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The value of (co s eca -sin a) (sec a- cos a) (tan a+ cot a) is:
A. 4
B. 6
C. 2
D. 1
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Correct Answer - d
`(co s ec a-sina)(seca-cosa)(tana+cota)`
Put `a=45^(@)`
`(co s ec45^(@)-sin45^(@))(sec45^(@)-cos45^(@))(tan45^(@)+cot45^(@))`
`(sqrt(2)-(1)/sqrt(2))(1+1)`
`(1)/(2)xx2=1`
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