What is an easy method you can use to find the value of sin (-11 pi/2) and cos 6 pi? πŸ₯‡

  Mathematics

Answer:

An angle of 2Ο€ rads us 1 revolution so 6Ο€ is 3 revolutions. cos(0) = 1, cos(2Ο€) = 1, cos(6Ο€) = 1.Β 

An angle of Ο€/2 is a quarter turn or right angle anticlockwise so an angle of – Ο€/2 is a quarter turn or right angle clockwise. Therefore, 11Ο€/2 is 11 right angles clockwise which is 2 3/4 full turns. Sin(Ο€/2) = 1, sin(-Ο€/2) = -1, cos(-11 Ο€/2) = sin(Ο€/2) = 1

It’s easy!

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