What is the difference between sin(90) = 0.893996664 and sin(90

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Why is sin1 on a scientific calculator 0.0174 while on a smartphone calculator, it is 0.84147? - Quora

cos(90-x)=sin(x) - Trigonometry

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What is the sum of serie: sin(1/k) + sin(2/k) + sin(3/k) + … sin(k/k)? Thankyou - Quora

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

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