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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--Attempt:cos^2x - 1 - sin^2x = 0cos^2x - 1 - (1 - cos^2x) = 0cos^2x - 1 - 1 + cos^2x = 02cos^2x - 2 = 0(2cos^2x/2)= (-2/2)cos^2x = -1cosx = square root of -1And I can't do anything with this now...what am I doing wrong?--Textbook answers:0, 180, 360--
Solve to the nearest minute: x is greater than or equal to 0 and less than 360.3sec^2 x-8tan-6=cotx
Find the value of x in the interval 0 is less than or equal to x and 360 is greater than or equal to x which satisfies the equation cos x - 2 cos x sin x.
solve for the exact value of x where 0 greater than or equal to X and less than/equal to 2 pi. cos^2 x-1=0 I did the factoring and FOILing and The two answers I got were: cosx=-1 cosx=1 x=pi x=0,2pi According to my instructor cosx=1's answers are not completly correct. I dont see what the problem is since cos(0) and cos(2pi) both =1. Am I missing something here? Thank you for your help.
tanx+secx=2cosx(sinx/cosx)+ (1/cosx)=2cosx(sinx+1)/cosx =2cosxmultiplying both sides by cosxsinx + 1 =2cos^2xsinx+1 = 2(1-sin^2x)2sin^2x + sinx-1=0(2sinx+1)(sinx-1)=0x=30 x=270but if i plug 270 back into the original equation i get undefined because tan 270 is undefined where did i go wrong?
Solve each equation for 0 is less than and equal to "x" is less than and equal to 3603sinx = 2cos^{2}x-----I don't know how to solve this equation...this is what I have, but I don't know if I'm on the right track or not3sinx = 1 - 2sin^{2}x3sinx - 1 + 2sin^{2}x = 02sin^{2}x + 3sinx - 1 = 0sinx(3 + 2sinx) = 1...and if I am, what do I do next now?-----The answers are:30 and 150 degrees
Select the point which is in the feasible region of the system of inequalities 4x+y is greater than or equal to 8 2x+5y is greater than or equal to 18 x is less than or equal to 0, y is less than or equal to 0
If 1 is equal to or greater than f(x) equal to or less than x squared plus 2x plus 2 for all x find lim f(x) as x approaches 1
Solve for x:sin2x + cos^2x = 10° < or equal to x < 360°
2x+y is less than or equal to 6 y is greater than 2x x-2y is greather than 0 please helpppp