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Question: The polar co-ordinates of (–1, \(\sqrt{3}\)) is-...

The polar co-ordinates of (–1, 3\sqrt{3}) is-

A

(2,π6)\left( 2,\frac{\pi}{6} \right)

B

(2,π3)\left( 2,\frac{\pi}{3} \right)

C

(2,2π3)\left( 2,\frac{2\pi}{3} \right)

D

(2,2π3)\left( - 2,\frac{2\pi}{3} \right)

Answer

(2,2π3)\left( 2,\frac{2\pi}{3} \right)

Explanation

Solution

r = x2+y2\sqrt{x^{2} + y^{2}}

r = 1+3\sqrt{1 + 3}= 2

a = tan–1 yx\frac{|y|}{|x|}

a = tan–1 (3\sqrt{3} = π3\frac{\pi}{3}–1, 3\sqrt{3}) lies in II quad.

\ q = p – a = p – π3\frac{\pi}{3} = 2π3\frac{2\pi}{3}

(2,2π3)\left( 2,\frac{2\pi}{3} \right)