samalami
can someone please help Pre calc please??
It's A, B, C, or D
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samalami
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EulerGroupie
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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...
EulerGroupie
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There is a nice little short cut too... once you find sin, cos, and tan... csc, sec, and cot are the reciprocals.
samalami
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@EulerGroupie is it A then??? the first choice?
EulerGroupie
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That is not what I got. What did you get for the missing side?
samalami
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12/3sqrt41
EulerGroupie
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eek!\[c ^{2}=a ^{2}+b ^{2}\]where c is the hypotenuse.
You have c and a... solve for b\[b=\sqrt{c ^{2}-a ^{2}}\]
EulerGroupie
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It comes out nice... not irrational. What do you get for the missing side now?
samalami
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9?
EulerGroupie
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Yes
EulerGroupie
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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?
samalami
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4/5
EulerGroupie
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Yes! Now cos A=adj/hyp... which is?
samalami
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3/4
samalami
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sorry thats not it!!
EulerGroupie
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Not what I got. adj=9, hyp=15...
samalami
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3/5
EulerGroupie
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Yes! tan?
samalami
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what is the equation for tan?
EulerGroupie
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opp/adj
samalami
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4/3 :)
EulerGroupie
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Yes!
samalami
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thank you, I understand the rest now
EulerGroupie
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Awesome! You're welcome.