# sin,cos,tan

Trigonometry equalities, inequalities and expressions - sin, cos, tan, cot

### sin,cos,tan

Every time that i do sin,cos or tan in my calculator its the wrong answer. I dont know what it is thats making me get the wrong answer but can somebody help me with how to set it up please?

babyj

Posts: 5
Joined: Wed Nov 28, 2007 6:12 pm

Could you write the problem here, please?
Math Tutor

Posts: 312
Joined: Sun Oct 09, 2005 11:37 am

Well i have a triangle and the hyp is 15 and one of the angles is 68 one is 90. I dint know how to get another side with just that. Could you help me?
babyj

Posts: 5
Joined: Wed Nov 28, 2007 6:12 pm

So you should use Sine Rule

Always when we have in one triangle 2 angles and one side and search for another side we use Sine Rule.

we have:

$\frac{a}{sin(A)} = \frac{b}{sin(B)}$

here we know angles A and B
and the one side too

so the other side is:

$a = \frac{b.sin(A)}{sin(B)}$

Do you understand?
Math Tutor

Posts: 312
Joined: Sun Oct 09, 2005 11:37 am

Yes i do thank you
babyj

Posts: 5
Joined: Wed Nov 28, 2007 6:12 pm

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