COMPLETE ANSWERS OFFERED
⫸ sine is odd, u=?. Answer: cos x
⫸ sin² x=?. Answer: 1/2(1-cos 2x)
⫸ cos² x=?. Answer: 1/2(1+cos 2x)
⫸ secant is even, u=?. Answer: tan x
⫸ tangent is odd, u=?. Answer: sec x
⫸ ∫tan x dx. Answer: ln|sec x|
⫸ ∫sec x dx. Answer: ln|sec x+tan x|
⫸ ∫csc x dx. Answer: ln|csc x-cot x|
⫸ ∫cot x dx. Answer: ln|sin x|
⫸ √a²-x², x=?. Answer: a sin θ