sin 90° = 1 (Why & How?)

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sin 90° = 1 (Why & How?)

1. sin(θ+2π)=sinθ 2. sin(90∘+θ)=cosθ 3.

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How to calculate BY HAND (NO CALC.)those trigonometry functions, both the first and third exercise? : r/askmath

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prove that sin(90-a)/cosec(90-a) + cos(90-a)/sec(90-a)=1

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Given Sin (90 – a) = 1/2 , find without using tables or calculators the value of Cos a.