Find dy/dx if y= 3√cosx
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y=3√cosx
dy/dx=3×1/2×(cosx)^-1/2 × -sinx
=3/2×sinx/√cosx
=3/2×√sinx.tanx
dy/dx=3×1/2×(cosx)^-1/2 × -sinx
=3/2×sinx/√cosx
=3/2×√sinx.tanx
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