What Is Cos 90

10 Oct 2023

Prove that sin a/sin(90-a) + cos a/cos(90-a) = sec a cosec a Cos 90 degrees What are values of trigonometric ratios for 0, 30,45, 60 and 90 degrees

sin 90=1 and cos 90=0 (Trignometric functions concept) - YouTube

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