If in the first quadrant

MATHEMATICS · Single correct · CBSE · Mathematics · Introduction to Trigonometry · Introduction to Trigonometry

Problem

If sin⁡θ=55\sin \theta = \frac{\sqrt{5}}{5} in the first quadrant, then select the correct option/(s) from the following options. (May have multiple correct answers) (1) A cos⁡θ=255\cos \theta = \frac{2\sqrt{5}}{5} (2) B tan⁡θ=12\tan \theta = \frac{1}{2} (3) C cot⁡θ×cos⁡θ=455\cot \theta \times \cos \theta = \frac{4\sqrt{5}}{5} (4) D cos⁡θ=105\cos \theta = \frac{10}{\sqrt{5}}

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