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JEE MATHEMATICS MCQ: TRIGONOMETRY RATIOS

1 Easy

1 of 1

Application +4 | -1

In a

\triangle A B C, \angle A=\pi / 2

, then

\cos ^2 B+\cos ^2 C

equals.

View answer and explanation

Correct option: C

1

Option C (1) is correct because in a right-angled triangle,

\angle A = \frac{\pi}{2}

, so

B + C = \frac{\pi}{2}

. Therefore,

\cos B = \sin C

, and

\cos^2 B + \cos^2 C = \sin^2 C + \cos^2 C = 1

.

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