evenkeel3x
New member
- Joined
- Feb 28, 2010
- Messages
- 14
Hey guys, you didn't fail me last time, let's try this again.
1: cos(2X)=cos^4(X)-sin^4(X)
All I've really done on this one is that I factored the ___^4 things, but that didn't really help all that much. Could there possibly be a cos-sin formula involved?
2: csc(2X)-cot(2X) = tan(X)
For this, I did the (hopefully correct) next step of:
((2X)/sin(2x))-((cos(2X)/(sin(2X)) = tan(x)
then I tried this...
(2(x)-cos(2x))/(2sin(x)cos(x))
Is this correct? I'm stuck. please help!
1: cos(2X)=cos^4(X)-sin^4(X)
All I've really done on this one is that I factored the ___^4 things, but that didn't really help all that much. Could there possibly be a cos-sin formula involved?
2: csc(2X)-cot(2X) = tan(X)
For this, I did the (hopefully correct) next step of:
((2X)/sin(2x))-((cos(2X)/(sin(2X)) = tan(x)
then I tried this...
(2(x)-cos(2x))/(2sin(x)cos(x))
Is this correct? I'm stuck. please help!