Posted by Sophie on Tuesday, June 16, 2009 at 5:26pm.
For 4x^2 - 4xy + y^2 = 4 find θ, the angle of rotation about the origin, to the nearest degree?
I got A, is this right?
Math - Reiny, Tuesday, June 16, 2009 at 6:44pm
I had -26.6 or 333.4 in a positive direction
tan 2θ = B/(A-C)
= -4/(4-1) = -4/3
2θ = -53.13
θ = -26.13
Math - Sophie, Tuesday, June 16, 2009 at 6:49pm
oh, so it is C?
Math - Reiny, Tuesday, June 16, 2009 at 6:51pm
has to be
didn't you also get -26.6 degrees?
that is not given.
What angle is coterminal with -26.6 ?
It is 333.4 .
Math - Reiny, Tuesday, June 16, 2009 at 6:55pm
Here is a webpage that has your type of question
press "STEP" to go through the problem.
Notice they leave their angle as a negative.
Math - Sophie, Wednesday, June 17, 2009 at 3:57pm
oohh yes i did! thanks!!
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