Monday

March 30, 2015

March 30, 2015

Posted by **NeedHelpPlz** on Friday, January 13, 2012 at 10:34pm.

cos180 degree = -1

sin45 degree = root(2)/2

cos(-135) = -root(2)/2

cot(-60) = -1/root(3) or -root(3)/3

What does cos or sin do to make the answer different?

please help

- Math -
**Steve**, Saturday, January 14, 2012 at 4:17amDraw a triangle. In this case, it extends to the left on the x-axis, and the height is zero. Cos180° = x/h = -1/1 = -1

Draw a triangle. The legs are 1,1, hypotenuse=√2.

sin = y/h = 1/√2 = √2/2

cos -135 = - cos 45 = -√2/2

Draw a triangle

cot -60 = x/y = 1/-√3 = -1/√3

- Math -
**NeedHelpPlz**, Saturday, January 14, 2012 at 8:04amhow do you know what is the side lengths for the cot-60 angle?

**Answer this Question**

**Related Questions**

Algebra II - Multiple Choice (theta) means the symbol 0 with the dash in it. 1.)...

math - There are no typos and no work b/c I don't know how to do them. Thanks. 1...

precalculus - find all solutions of each equations a) cos2x=square root of 3/2 b...

maths surds please help and explain - Simplify A.1/root a +2 b.root 18/25 c.root...

Math - There are no typos and no work b/c I don't know how to do them. Thanks. 1...

Trig. - Can you please review this to see if I did this right? 2cos^2x+3cosx=0 ...

math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...

Math - Which of the following are inverse functions? 1. Arcsin x and sin x 2. ...

math (repost) - Which of the following are inverse functions? 1. Arcsin x and ...

Algebra - Use the quadratic formula to solve the equation. Give exact answers: ...