Recent content by helppleasemath

I still need help please :(

ϕ=0.9273 \phi = 0.9273 radians (or 53.13 degrees), then cosϕ=0.6 \cos\phi=0.6 . ϕ=0.9273 \phi = -0.9273 radians (or -53.13 degrees), then cosϕ=0.6 \cos\phi=0.6 . ϕ=0.9273 \phi = 5.356 radians (or 306.876 degrees), then cosϕ=0.6 \cos\phi=0.6 . ϕ=0.9273 \phi = 7.21 radians (or 413.103...

oh ok sorry wasnt sure what word to use lol.

x1 = -0.964 x2 = -0.036 x3 = 2.178 x4 = 3.105 x1 = (-0.964*2)+1 = -0.928 x2= (-0.036*2)+1 = 0.928 x2= (2.178*2)+1 = 5.356 x3= (3.105*2)+1 = 7.21 I don't really understand why we do *2+1 and how to find the result in radian

Homework Statement I have the function f(x) = cos(2x+1) I need to resolve f(x) = 0.6 when -PI <= x <= PI then put my answers in a Trigonometric Circle Homework EquationsThe Attempt at a Solution First I do this: cos(2x+1) = 0.6 and use my TI calculator to solve for X and I find the following...

Homework Statement [/B] I have to derivate f(x) f(x) = 1/x +1/(x+1) Answer is = -1/x2 - 1/(x+1)2 I can't seem to get to that answer :( thank you Homework EquationsThe Attempt at a Solution f(x) = (1/x +1/(x+1))' = (2x+1)/x(x+1)' = ((2x+1)' * (x(x+1)-(2x+1)*(x(x+1)')/x2(x+1)2...