Find the value of sin 289 degree by finding the reference an

Find the value of sin (289 degree) by finding the reference angle and attaching the proper sign.

Solution:

Sin(289^o) = Sin( 180^o + 109^o)

since it is lying in third coordinates

therefroe value of sin is negative in 180

= - Sin(109^o)

using calculator

= -0.94552

Answer: Sin(289^o) = -0.945