differentiation

Question: The equation of tangent to the curve $y=2\cos x$ at $x=\frac{\pi }{4}$ is

1) $y-\sqrt{2}=2\sqrt{2}\left( x-\frac{\pi }{4} \right)$

2) $y+\sqrt{2}=\sqrt{2}\left( x+\frac{\pi }{4} \right)$

3) $y-\sqrt{2}=-\sqrt{2}\left( x-\frac{\pi }{4} \right)$

4) $y-\sqrt{2}=\sqrt{2}\left( x-\frac{\pi }{4} \right)$

Solution:

Explanation: No Explanation

Tangent and Normal

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