can someone please help Pre calc please?? It's A, B, C, or D picture attached vvv xoxo

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can someone please help Pre calc please?? It's A, B, C, or D picture attached vvv xoxo

Mathematics
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Use pythagorean theorem to get your third side, then use triangular trig ratios to get the trig functions... like sin(theta)=opp/hyp, cos(theta)=adj/hyp, etc...
There is a nice little short cut too... once you find sin, cos, and tan... csc, sec, and cot are the reciprocals.

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@EulerGroupie is it A then??? the first choice?
That is not what I got. What did you get for the missing side?
12/3sqrt41
eek!\[c ^{2}=a ^{2}+b ^{2}\]where c is the hypotenuse. You have c and a... solve for b\[b=\sqrt{c ^{2}-a ^{2}}\]
It comes out nice... not irrational. What do you get for the missing side now?
9?
Yes
Now, all of those trig functions have angle A in them... so you are looking at the triangle from that corner. If that's the case, then 9 is your adjacent side, 12 is your opposite side, and 15 is the hypotenuse. So what is sin A=opp/hyp?
4/5
Yes! Now cos A=adj/hyp... which is?
3/4
sorry thats not it!!
Not what I got. adj=9, hyp=15...
3/5
Yes! tan?
what is the equation for tan?
opp/adj
4/3 :)
Yes!
thank you, I understand the rest now
Awesome! You're welcome.

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