Hi

sin(x) =  /2

interval [0,360]. 

x = π/3,  2π/3    0r x = 60° , 120°  See Below.

...........

4t = x

t = (1/4)x

t =  π/12,  2π/12   0r  t = 15°, 30°

..........

(cosx, sinx) Summary Unit Circle

.

 

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