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17 July, 14:31

How to solve for the sin 11pi/2 without using a calculator?

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  1. 17 July, 15:07
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    You have to do some trigonometric transformations:

    sin (11π/2) = sin (8π/2 + 3π/2) = sin (4π + 3π / 2) = sin (3π / 2) =

    = sin 270° = - 1
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