Some Ugly Angles

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Let θ = cos ⁡ − 1 2 5 \theta=\cos^{-1}\frac{2}{\sqrt{5}} and α = sin ⁡ − 1 1 10 . \alpha=\sin^{-1}\frac{1}{\sqrt{10}}. What is θ + α , \theta+\alpha\text{,} in degrees?


The answer is 45.

Trevor B. by Trevor B. , 22, USA

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1 solution

Anurag Bhardwaj
Jan 4, 2014

BY using inverse trigo. formulaes

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