Wednesday

January 28, 2015

January 28, 2015

Posted by **Leah** on Monday, June 11, 2012 at 5:03am.

sin(-13π/6)

cot 11π/6

cot(-14π/4)

sec 23π/6

Thanks in advance ^^; and if you'd tell me step by step on how to do problems like these I'd be grateful :D

- Math/Trig -
**Steve**, Monday, June 11, 2012 at 11:29amsin(-θ) = -sinθ

sin(θ±2kπ) = sinθ

so, sin(-13π/6) = sin(-π/6) = -1/2

tan(θ±kπ) = tanθ -- same for cot

cot(11π/6) = cot(-π/6) = -cot(π/6) = -√3

cot(-14π/4) = cot(2π/4) = cot(π/2) = 0

sec(23π/6) = sec(-π/6) = √3/2

**Answer this Question**

**Related Questions**

Precalc/Trig - Sorry there are quite a few problems, but I just need to know if ...

Math, please help - Which of the following are trigonometric identities? (Can be...

Trig Help! - Question: Trying to find cos π/12, if cos π/6 = square ...

Math - Evaluate *Note - We have to find the exact value of these. That I know to...

Math integrals - What is the indefinite integral of ∫ [sin (π/x)]/ x^...

Trig - find all solutions to the equation √3 csc(2theta)=-2 Would the ...

Trigonometry - How do I evaluate the trigonometric functions of the quadratic ...

Precalculus - Use one of the identities cos(t + 2πk) = cos t or sin(t + 2&#...

Calculus - How do I find the critical values? y= 4/x + tan(πx/8) What I ...

Trig - The set of solution(s) of 2 cos^2 (θ) - 13 cos(θ) + 6 = 0 that ...