Question

sin(pi/4)sin(pi/6) = 1/2 (___(pi/12)- cos (5PI/12)
could be most likely sin,cos, tan, etc

Answer 1

your quetion is not clear enough

Answer 2

use the identity :
sinA sinB = -1/2 [cos(A+B) - cos(A-B)] = 1/2 [cos(A-B) - cos(A+B)]

Answer 3

not sure how that applies

Answer 4

what's pi/4 - pi/6

Answer 5

- something?

Answer 6

could u calculate difference between 2 fractions, like 1/2 - 1/3 :)

Answer 7

1/2 - 1/3 = 1/6 ?

Answer 8

sure... now calculate pi/4 - pi/6 = ...

Answer 9

if u can determine it, the numerator is as the answer for ur question above :p

Answer 10

pi/12?

Answer 11

yes... for pi/4 + pi/6 = 5pi/12
so, the complete answer be cos(pi/12) - cos(5pi/12)

Answer 12

ty

Answer 13

welcome