Trigonometry functions

Question

Sin^2 pi/12+sin^2 5pi/12

Answer 1

You can just plug in the radians to get the answer.

Or

convert to degrees and plug in the degrees

pi/12 --> 15 degrees , 5pi/12 = 75 degrees

Or

Use the 1/2 angle formula for a nice 30-60-90 triangles in QI and QII

sin²(x) = (1-cos(x/2))/2