I'm having a little trouble, here's the question:
If sin and cos , and and are positive acute angles, find
Okay, you know the three formulas:
To use those formulas, we need more trig values.If , and and are positive acute angles, find
We can use: .
. . . .
. . Hence, we have: .
Use the same procedure on to find
. . then you can use those formulas . . .