I'm having trouble with this problem. My professor never showed how to get the answers in the key, so I have no idea how to solve these.
6) Suppose that sinA = 3/5 and tanA<0. Find the following. Clearly explain your reasoning and draw pictures (when appropriate) to help justify your answer.
a) cosA
b) tanA
c) sin(A+pi)
d) sin(-A)
Thanks beforehand for the help.
Ok I worked with reply 3. I am supposed to use the even-odd properties? I don't know how you got -sinA from sin(A+pi).
For d and c, I got -3/5.
I'm lost on a and b. I don't know how to use the information. My teacher got -4/5 for a but when I attempted it I had -3/5.