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## Homework Statement

Cos X *[Cosec (270+X)][tan X] = .............

## Homework Equations

Cosec (270+X) = - sec X

Cos X * sec X = 1

## The Attempt at a Solution

Cos X * -Sec X * tan X = - tan X

then the solution is

Cos X *[Cosec (270+X)][tan X] = - tan X

Is it right?Can it has another solution??

Thanks