Question

Find an exact value.

sine of {19pi / 12 }

Answer 1

pi/12=15 degrees
19 .15=285

sin285=?
285=270+15

sin(270+15)=sin270cos15+cos270sin15
= - cos15

= - cos(45-30)
= - ( cos45cos30+sin45sin30)

= - sqrt(2)/2. sqrt(3)/2 - sqrt(2)/2 .1/2

= - sqrt(6)/4- sqrt(2)/4

Answer 2

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Answer 3

wow, i actually got it right the first time, thank you!!

Answer 4

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