Which of the following equations are identities? Check all that apply.
A. sin2x - cos2x = 1
B. tan2x = sec2x - 1
C. sin2x = 1 - cos2x
D. cot2x + csc2x = 1
Answer:
B - Comes from 1+tan2x=sec2x and C - Comes from sin2x+cos2x=1.
Which of the following equations are identities? Check all that apply.
A. sin2x - cos2x = 1
B. tan2x = sec2x - 1
C. sin2x = 1 - cos2x
D. cot2x + csc2x = 1
Answer:
B - Comes from 1+tan2x=sec2x and C - Comes from sin2x+cos2x=1.