Homework Help: Math

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?
a) 27°
b) 63°
c) 333°
d) 307°

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

http://education.yahoo.com/homework_help/math_help/problem?id=miniprecalcgt_8_1_1_26_70

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!!

Answer this Question

Related Questions

Trigonometry - Please show me the work so i understand 2. Find the reference ...
phys - Find every angle θ between 0 and 360° for which the ratio of...
Trig - Use a calculator to find θ to the nearest tenth of a degree, if ...
trig - Use a table of trigonometric values to find the angle θ in the ...
Trig - Jessica attains a height of 4.7 feet above the launch and landing ramps ...
math trigono - 1. If tanθ = –√3 , what is the value...
Math30 - An angle with a negative rotation passes through the point(-5,-8). To, ...
Math - Use your protractor to find the measure of the angle to the nearest ...
Physics - A projectile is fired from the origin with an initial velocity V&#...
Math - In a trapezium ABCD,ABperpendicular DC.if angle A=4x degree,angle B=(6x+...

For Further Reading

First Name:
School Subject:
Answer: