Asked by Zu

use the unit circle to investigate equivalent expressions involving the six trig functions of (x + pi) where x lies in the first quadrant. add these to your trigonometric identities table

Answers

Answered by oobleck
adding π is equivalent to rotating halfway around the origin.
That changes the sign of x and y.
Now, you know that
sinθ = y/r
cosθ = x/r
tanθ = y/x
since both x and y have changed sign, and r is positive, what does that tell you about the trig functions?
Answered by Zu
that i have to use sin(pi+x)?
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