Posted by Anonymous on Thursday, November 22, 2007 at 5:35pm.
Solve the following equation for
0 less than and/or equal to "x" less than and/or equal to 360
cos^2x - 1 = sin^2x
cos^2x - 1 - sin^2x = 0
cos^2x - 1 - (1 - cos^2x) = 0
cos^2x - 1 - 1 + cos^2x = 0
2cos^2x - 2 = 0
cos^2x = -1
cosx = square root of -1
And I can't do anything with this now...what am I doing wrong?
0, 180, 360
Math - Solving for Trig Equations - bobpursley, Thursday, November 22, 2007 at 5:40pm
On the fourth/fifth line, you erred. When you add 2 to both sides, the right side is positive, not negative.
cos x= +- 1
giving 1, 180,360
Answer This Question
More Related Questions
- Math - Solving Trig Equations - Solve each equation for o is less than and/or ...
- Precalculs - I have no idea how to do these type of problems. -------Problem...
- TRIG! - Posted by hayden on Monday, February 23, 2009 at 4:05pm. sin^6 x + cos^6...
- tigonometry - expres the following as sums and differences of sines or cosines ...
- algebra 2 and trig (math) - Find the value of x in the interval 0 is less than ...
- trig - Reduce the following to the sine or cosine of one angle: (i) sin145*cos75...
- Math - Solving Trig Equations - What am I doing wrong? Equation: sin2x = 2cos2x ...
- Mathematics - Trigonometric Identities - Let y represent theta Prove: 1 + 1/tan^...
- MathsSs triG - Consider sin(x-360)sin(90-x)tan(-x)/cos(90+x) 1.A.SIMPLIFY sin(x-...
- algebra - Can someone please help me do this problem? That would be great! ...