# Math Help - sine and cosine

1. ## sine and cosine

Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

The question :

e = 54.0
sin 50 degrees sin 44 degrees

than it goes

e= 54.0 sin 50 degrees
sin 44 degress

than it equals out to

e=59.6 (there's a little dot over the = sign)

and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...

2. Originally Posted by nikkinarcotic
Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

The question :

e = 54.0
sin 50 degrees sin 44 degrees

than it goes

e= 54.0 sin 50 degrees
sin 44 degress

than it equals out to

e=59.6 (there's a little dot over the = sign)

and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...

okay so it didn't type it out right...
when your first given the problem.. the 50 degrees is under the e and the 44 degrees is under the 54.0

and than the 44 degrees is under the 54 sin 50 degrees

3. Originally Posted by nikkinarcotic
Okay so I am doing trig, and in it i am dealing with "sin" "cos" and "tan" BUT i can't figure out how to get rid of the "sin" or the "cos" in a question. The book doesn't even tell me how to either.

The question :

e = 54.0
sin 50 degrees sin 44 degrees

than it goes

e= 54.0 sin 50 degrees
sin 44 degress

than it equals out to

e=59.6 (there's a little dot over the = sign)

and i am so confused... because no where does it tell you how to get rid of these signs.... PLEASE someone help...
evaluate the sines in your calculator.

$\sin 50 \approx 0.766044443$

$\sin 44 \approx 0.69465837$

4. Originally Posted by Jhevon
evaluate the sines in your calculator.

$\sin 50 \approx 0.766044443$

$\sin 44 \approx 0.69465837$
yeah but once you evaluate them, how does it get rid of them...
like how do you go from

e= 54.0 sin 50 degrees / sin 44 degrees (/ means over)
and than get e=59.6.. like how does that make sense?

5. Originally Posted by nikkinarcotic
yeah but once you evaluate them, how does it get rid of them...
like how do you go from

e= 54.0 sin 50 degrees / sin 44 degrees (/ means over)
and than get e=59.6.. like how does that make sense?
as i said, plug it into your calculator

$e = \frac {54(\sin 50)}{\sin 44} = \frac {54(0.766044443)}{0.69465837} \approx 59.5$

6. Originally Posted by Jhevon
as i said, plug it into your calculator

$e = \frac {54(\sin 50)}{\sin 44} = \frac {54(0.766044443)}{0.69465837} \approx 59.5$
THANK YOU!