1.

Which of the followingdo/does not reduce to unity ?

Answer»

`(sin(180^(@) + A))/(tan (180^(@) + A)).(cot(90^(@) +A))/(tan(90^(@) +A)).(cos(360^(@) -A)cosecA)/(sin(-A))`
`(sin(-A))/(sin(180^(@) +A))-(tan(90^(@) +A))/(COTA)+ (cosA)/(sin(90^(@) +A))`
`(sin 24^(@) cos6^(@) - sin 6^(@)sin66^(@))/(sin 21^(@) cos39^(@)-cos51^(@) sin69^(@))`
`((cos(90^@)+A)SEC(-A)tan(180^(@)-A))/(sec(360^(@) +A)sin(180^(@)+A)cot(90^(@) -A))`

Answer :B::C::D


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