# Math Help - graph sketching

1. ## graph sketching

How to sketch the graph of $\sin x -3 \cos x$

i know i can do this : $\sin x -3 \cos x = \sqrt{10} \sin({\color{red}x - 71.6})$

How can i sketch this when the one in red is not $\theta$or $2 \theta$

Thanks .

2. Originally Posted by thereddevils
How to sketch the graph of $\sin x -3 \cos x$

i know i can do this : $\sin x -3 \cos x = \sqrt{10} \sin({\color{red}x - 71.6})$

How can i sketch this when the one in red is not $\theta$or $2 \theta$

Thanks .
Sketch the graph of $y = \sqrt{10} \sin({\color{red}x})$. Then translate the graph by 71.6 units to the right.

3. Originally Posted by mr fantastic
Sketch the graph of $y = \sqrt{10} \sin({\color{red}x})$. Then translate the graph by 71.6 units to the right.

Thanks . Can u recommend me a useful online graphing software ?