# Math Help - Some trig questions part 1

1. ## Some trig questions part 1

1) $\cot \theta = -7/2, \cos \theta$ .........(Jhevon says: $\color{red}\cos \theta$ what?)
2) $\tan^{-1}(1)$
3) $\sin^{-1}(1)$

2. Originally Posted by donnyB

1) cot0= -7/2, cos0
2) tan=1(1)
3) sin-1(1)
1) cot0= -7/2, cos0

$\cot0$ should be equal to $0$ right?

Or you mean $\cot\theta$?

If yes, then

By Pythagorous Theorem, you can get $x$.
$\cot\theta$ will be -ve when II and IV quadrants.

2) tan=1(1)

Where is the reference angle for your tangent?

3) sin-1(1)

Do you mean $\sin^{-1}1$?

If yes,

From the graph of sine, the angle should be $90^o, 450^o, 810^o, ...$