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Question
Find `dy/dx, if y = cos^-1 ( sin 5x)`
Solution
`y = cos^-1 ( sin 5x )`
`y = cos^-1 [ cos( π/2 - 5x )]`
∴ `y = π/2 - 5x`
Diff.w.r.t.x.
`dy/dx = 0 - 5 xx 1`
`dy/dx = - 5`
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