anonymous
  • anonymous
Please help on PreCal
Mathematics
katieb
  • katieb
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cgreenwade2000
  • cgreenwade2000
Ok go
anonymous
  • anonymous
Find an expression equivalent to... |dw:1358280084977:dw|
cgreenwade2000
  • cgreenwade2000
any expression? or is this something needing to involve a certain method? There's a number of ways to find an equivalent.

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anonymous
  • anonymous
I am not sure. The answer choice are... A. sec^2 theta B. cot theta C. tan^2 theta D. cos^2 theta
cgreenwade2000
  • cgreenwade2000
|dw:1358280261643:dw|
cgreenwade2000
  • cgreenwade2000
|dw:1358280353086:dw|
cgreenwade2000
  • cgreenwade2000
Oh, my pictures got cut off, but the math is easy to see if you know definitions of trig functions and basic algebra skills.
anonymous
  • anonymous
Yes I can see. Thanks for writing out the equations. So the answer would be A. sec^2 theta?
cgreenwade2000
  • cgreenwade2000
|dw:1358280516292:dw|
anonymous
  • anonymous
So can you help with another one?
cgreenwade2000
  • cgreenwade2000
YEs. Post a new question
anonymous
  • anonymous
Simplify|dw:1358281039137:dw|
cgreenwade2000
  • cgreenwade2000
Tan^2theta + 1 = sec^2theta This is very useful to remember.
anonymous
  • anonymous
And can you check a question? The question is Which expression is equivalent to cos(pi-theta)? I got -cos theta. Is that right?
cgreenwade2000
  • cgreenwade2000
I'll answer that one quickly before I finish your first problem.
cgreenwade2000
  • cgreenwade2000
|dw:1358281166638:dw|
cgreenwade2000
  • cgreenwade2000
Another good rule to remember. So, yes your answer is correct.
anonymous
  • anonymous
Thanks and for my second question, I am still confused. Can you explain more? It was the simplify one
cgreenwade2000
  • cgreenwade2000
|dw:1358281344118:dw|
cgreenwade2000
  • cgreenwade2000
|dw:1358281440642:dw|
anonymous
  • anonymous
Oh ok. So since cos^2 theta can be crossed out, you move the 1st numerator over the 2nd denominator. That makes more sense. Thanks!
cgreenwade2000
  • cgreenwade2000
Well, it's not being crossed out. It's cos^2 theta divided by itself which is one. And then as fractions go, numerator times numerator and denominator times denominator.
anonymous
  • anonymous
Oh ok, Do you know how to do this one.... Solve \[4\sin ^{2}x+4\sqrt{2}cosx-6=0\]
cgreenwade2000
  • cgreenwade2000
Post this one as a new question up top and close this question.
anonymous
  • anonymous
ok

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