Question

sin(2cos^-1 15/17) find the value


Please help!!??

Answer 1

let u=arccos(15/17)
draw a right triangle

Answer 2

cos(u)=15/17

Answer 3

recall sin(2u)=2sin(u)cos(u)

Answer 4

so you will want to find sin(u) from your right triangle

Answer 5

then multiply your 3 factors there

Answer 6

So what would the answer be... And how would I actually work ...?! Thanks

Answer 7

Have you tried anything I wrote yet?

Answer 8

you need to evaluate 2sin(u)cos(u) given cos(u)=15/17 (use quadrant one to build right triangle)

Answer 9

yes so it is 240/289