• January 23rd 2013, 11:44 AM
Greenstxr

(1) Sin 186

(2) tan 150

(3) cos(-65)
• January 23rd 2013, 01:42 PM
MarkFL
Let's look at the quadrants first...assuming the arguments are in degrees, can you state what range of degrees the 4 quadrants encompass, for $0^{\circ}\le\theta<360^{\circ}$?
• January 23rd 2013, 01:46 PM
Greenstxr
I have an idea just wanted to see if I was correct without actually embarrassing myself. Can you answer the first question number 1?
• January 23rd 2013, 01:56 PM
MarkFL
Quadrant I: $0^{\circ}<\theta<90^{\circ}$

Quadrant II: $90^{\circ}<\theta<180^{\circ}$

Quadrant III: $180^{\circ}<\theta<270^{\circ}$

Quadrant IV: $270^{\circ}<\theta<360^{\circ}$

So, in which quadrant is $186^{\circ}$? And don't worry about embarrassing yourself, there is no shame in asking questions, the only shame is in not asking when you don't know. (Nod)
• January 23rd 2013, 02:03 PM
Greenstxr
Lol ok cool I have no idea when it comes to sin 186... Or which quadrant it would be in.
• January 23rd 2013, 02:10 PM
MarkFL
Which range of values does 186° match? Is it in between 0° and 90°, or in between 90° and 180°, or in between 180° and 270°, or in between 270° and 360°?
• January 23rd 2013, 02:15 PM
Greenstxr
Guessing 3rd quadrant 180 and 270
• January 23rd 2013, 02:17 PM
MarkFL