Question

Hello, how to find 4 sin 5 Pi/12

Answer 1

pi= 180

Answer 2

can you solve it completely?

Answer 3

i guess you want to find this value without using a calculator?

Answer 4

yes

Answer 5

ok pi/12 = 180/12 = 15 degrees
one way would be to use the relation

sin(a - b) = sina cosb - cosa sinb

let a = 60 and b = 45

Answer 6

you can use the exact values of sines cosines of 45 and 60 degrees from the standard triangles: