Wednesday

March 4, 2015

March 4, 2015

Posted by **JOHN** on Wednesday, January 4, 2012 at 10:05pm.

tan 1400°

cos 9π

cos 13π/2

sin (-17π)

- Pre Calc -
**Reiny**, Wednesday, January 4, 2012 at 10:34pmsubtract multiple of 360° (1400/360 = 3.8..

so

tan 1400°

= tan320° , 320 is in IV and 40° from the x-axis

= -tan40

= ....

cos 9π

= cos π , (took away 4 multiples of 2π)

= -1

cos 13π/2

= cos π/2 (took away 6π)

= 0

sin(-17π)

= sin(-17π + 18π) , ( I added 9 rotations)

= sin π

= 0

**Answer this Question**

**Related Questions**

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

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

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

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

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

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

pre calc - evaluate the trigonometric function of the given quadrantal angle. ...

product of function - Given: f(x)=2 cos x and g(x)=sin x. Which of these ...

Math 2nd question - Express as a single sine or cosine function (note: this is ...

TRIGONOMETRY - Can you check my work, please? This is for a trig study guide for...