Question

Help on a Identity question? Its attatched

Answer 1

ga ga

Answer 2

Do you think you could help? @mathmale

Answer 3

\[5^2+12^2=13^2\]

Answer 4

I already know that @GABI_J

Answer 5

So what are you troubled with then ?

Answer 6

My answer should be one of these?

Answer 7

you are using a half angle for sin. So you know that sin is -12/13 .

I don't remember the l=half angle for sin, sorry.

Answer 8

I don't see this as a question involving a trig identity. Rather, you are asked to find the angle in the second quadrant that has a cosine value equal to -5/13. Please consider drawing this angle in the 2nd quadrant. Use the Draw utility, below.