Ok go

2. Rosy95

Find an expression equivalent to... |dw:1358280084977:dw|

any expression? or is this something needing to involve a certain method? There's a number of ways to find an equivalent.

4. Rosy95

I am not sure. The answer choice are... A. sec^2 theta B. cot theta C. tan^2 theta D. cos^2 theta

|dw:1358280261643:dw|

|dw:1358280353086:dw|

Oh, my pictures got cut off, but the math is easy to see if you know definitions of trig functions and basic algebra skills.

8. Rosy95

Yes I can see. Thanks for writing out the equations. So the answer would be A. sec^2 theta?

|dw:1358280516292:dw|

10. Rosy95

So can you help with another one?

YEs. Post a new question

12. Rosy95

Simplify|dw:1358281039137:dw|

Tan^2theta + 1 = sec^2theta This is very useful to remember.

14. Rosy95

And can you check a question? The question is Which expression is equivalent to cos(pi-theta)? I got -cos theta. Is that right?

|dw:1358281166638:dw|

18. Rosy95

Thanks and for my second question, I am still confused. Can you explain more? It was the simplify one

|dw:1358281344118:dw|

|dw:1358281440642:dw|

21. Rosy95

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!

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.

23. Rosy95

Oh ok, Do you know how to do this one.... Solve $4\sin ^{2}x+4\sqrt{2}cosx-6=0$

Post this one as a new question up top and close this question.

25. Rosy95

ok