List of trigonometric identities - Wikipedia, the free encyclopedia
This will be helpful here is the first
This gives
Could I get some help with the following:
sin{1/2acrsin(-7/25)}
cos(1/2arctan 8/15)
tan(1/2acrcos 3/5)
I know how to do them if the 1/2 isn't in there but I don't know how to get the answers for them. The answers btw are:
1. -1/10 * 2^(1/2)
2. 4/17 * 17^(1/2)
3. 1/2
Thanks in advance.
List of trigonometric identities - Wikipedia, the free encyclopedia
This will be helpful here is the first
This gives