cot(-theta) = cot(theta) cot(-theta) = -cot(theta) cot(-theta) = cot(-theta) cot(theta + pi) = cot(theta) cot(theta + 2pi) = cot(theta)

well, 5pi/4 = pi + pi/4 what do you think now?

The second and fourth one?

Yes, it is the second and fourth one:) Thanks, Steve!

looks good to me. Nice going.

for honors: 1. D (4pi) 2. B, D (cot(-θ)=-cot(θ)), (cot(θ+pi)=cot(θ) 3. A, B (f(x)=csc x), (f(x)=1/sin x)

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