This problem probably should be easy, but I don't remember learning the basic way to do these problems: Write the trigonometric expression as an algebraic expression:
cos(arccos x + arcsin x)
The answer is zero, but I don't know how to get there...
So I'm supposed to find the exact values of the sine, cosine, and tangent of an angle by using a sum or difference formula ( i.e. sin(x+y)=sin(x)cos(y)+cos(x)sin(y) ), but this is the angle I was given: ${-13\pi}/{12}$. How do I use a sum or difference formula to get the sin, cos, and tan of that?
(Wondering) How do you get that from the equation? By guessing and plugging in -2 and seeing if it equals zero?
...because I have the answers in the back of the book, but I don't know how to technically get them!
So I'm supposed to find all the real zeros of this polynomial function:
$\int$ $\left(x\right)$ = $x^3$ + 3$x^2$ - 4$x$ - 12
Usually, to find the zeros, I would use the quadratic function
$\frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$
But what do I do with the 3 at the beginning of the function? I...
I feel like this should be a super easy problem, but I'm not understanding something about it.
The graph of y = f(x) passes through the points (0, 1), (1, 2), and (2, 3). Find the corresponding points on he graph y = f(x + 2) - 1. I graphed the (x + 2) - 1, but what does it mean by...
Hi again I'm trying to graph a function in WolframlAlpha, but I can't figure out how to set limits on the x-value's domain. Is that an option for that site? I'm trying to do this function set:
_____ 4-x^2, x < -2
h(x) = 3 + x, -2 \le x < 0
_____x^2 + 1, x \ge 0
It's hard enough to...