Wednesday

April 23, 2014

April 23, 2014

Posted by **Danny** on Monday, June 15, 2009 at 6:38pm.

My answer: (pi/4)+2(pi)k, (7pi/4) + 2(pi)k

Solve 2cos^2 x-5cosx+2=0 for principal values of x.

My answer: 60 and 300 degrees

- Pre Cal -
**Reiny**, Monday, June 15, 2009 at 8:43pmVery good, I agree with both answers.

Is there any reason why you gave the first answers in radians and the second in degrees?

**Related Questions**

Pre Cal. - So I posted these...but no one answered them. Are they right? Solve ...

Advanced Math - Solve 4sin^2 x + 4sqrt(2) cos x-6 = 0 for all real values of x. ...

math - Eliminate the parameter (What does that mean?) and write a rectangular ...

math - Use the exact values of the sin, cos and tan of pi/3 and pi/6, and the ...

Trigonometry - Checking my work - Find the sum of the three smallest positive ...

Precalculus check answers help! - 1. Which expression is equivalent to cos ...

trig - Solve the equation for cos theta-tan theta=0 for greater than or egual to...

trigonometry - im really stuck on these, can anyone help me and also explain how...

Pre-Cal - Find the 5 roots of x^5+1=0 in polar and Cartesian form. (x^5 means x ...

Pre-Cal(Please check) - Approximate the equation's solutions in the interval (0,...