For questions 1 – 5, decide whether the equation is a trigonometric identity. Explain your reasoning.
1. cos^2 x(1 + tan^2 x) = 1
Answer:
2. sec x tan x(1 – sin^2 x) = sin x
Answer:
3. csc x(2sin x - ?2) = 0
Answer:
4. cos^2(2x) – sin^2(2x) = 0
Answer:
5. sin^2 ? csc^2 ? = sin^2 ? cos^2 ?
Answer:
1. cos^2 x(1 + tan^2 x) = 1
Answer:
2. sec x tan x(1 – sin^2 x) = sin x
Answer:
3. csc x(2sin x - ?2) = 0
Answer:
4. cos^2(2x) – sin^2(2x) = 0
Answer:
5. sin^2 ? csc^2 ? = sin^2 ? cos^2 ?
Answer: