# Trigonometry

function y=4-2sin(2t+pi/2), where t is measured in radians. choose one option which gives the value of the function when t=pi radians.
a)0 b)1 c)2 d)4 e)pi/4 e)pi/4 f)pi/2 g)pi h)2pi

1. y=4-2sin(2t+pi/2) , when t= π
y = 4 - 2sin(2π + π/2) = 4 - 2sin(5π/2)
= 4 - 2sin(π/2) , since π/2 and 5π/2 are coterminal angles.
= 4 - 2
= 2

posted by Reiny
2. Cheers Reiny

posted by lee pearce

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