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Differentiate cos - sin 2 - JAMB Mathematics 2006 Question

Differentiate (cos θ - sin θ)2

A
-2 cos 2θ
B
-2 sin2θ
C
1 - 2 cos 2θ
D
1 - 2 sin 2θ
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Correct Option: A

y = (cosθ - sinθ)

dy/dx = 2(cosθ - sinθ)(-sinθ - cosθ)

dy/dx = 2(-cosθsinθ - cos2θ + sin2θ)

dy/dx = 2(- cos2θ + sin2θ)

= -2(cos2θ - sin2θ)

= -2(1 - sin2θ)

= -2cos2θ

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