Answer:
2, 3, 6
Step-by-step explanation:
Answer:
2
Step-by-step explanation:
C is too small to have more.
Answer:
Step-by-step explanation:
First you mean: cos2x = (cosx)^2
For A. 2(cosx)^2-1 = 1 - 2(sinx)^2
we have (cosx)^2 + (sinx)^2 = 1, This is an identity
For B. secx cscx(tanx + cotx) = sec2x + csc2x
So the B is an identity.
For C, I do not understand the ?
For D secax is what?
Parallel means same slope, so in the image, line PQ is connected by a line. The other point I made has a line parallel through it.