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  1. AP Pre Calculus
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Describe the key features of the graph of y=arcsin⁡(x)y = \arcsin(x)y=arcsin(x).

Domain: [-1, 1], Range: [−π2,π2][-\frac{\pi}{2}, \frac{\pi}{2}][−2π​,2π​], increasing function, symmetric about the origin.

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Describe the key features of the graph of $y = \arcsin(x)$.
Domain: [-1, 1], Range: $[-\frac{\pi}{2}, \frac{\pi}{2}]$, increasing function, symmetric about the origin.
Describe the key features of the graph of $y = \arccos(x)$.
Domain: [-1, 1], Range: $[0, \pi]$, decreasing function, no symmetry.
Describe the key features of the graph of $y = \arctan(x)$.
Domain: $(-\infty, \infty)$, Range: $(-\frac{\pi}{2}, \frac{\pi}{2})$, increasing function, symmetric about the origin, horizontal asymptotes at $y = \pm \frac{\pi}{2}$.
How does the range restriction of arcsin affect its graph?
The graph is bounded between $y = -\frac{\pi}{2}$ and $y = \frac{\pi}{2}$, ensuring it's a function (passes the vertical line test).
How does the range restriction of arccos affect its graph?
The graph is bounded between $y = 0$ and $y = \pi$, ensuring it's a function (passes the vertical line test).
How does the range restriction of arctan affect its graph?
The graph is bounded between $y = -\frac{\pi}{2}$ and $y = \frac{\pi}{2}$, ensuring it's a function (passes the vertical line test).
How do you evaluate $\arcsin(\frac{1}{2})$?
Find the angle within the range of arcsine ($[-\frac{\pi}{2}, \frac{\pi}{2}]$) whose sine is $\frac{1}{2}$. Answer: $\frac{\pi}{6}$.
How do you evaluate $\arccos(0)$?
Find the angle within the range of arccosine ($[0, \pi]$) whose cosine is 0. Answer: $\frac{\pi}{2}$.
How do you evaluate $\arctan(1)$?
Find the angle within the range of arctangent $(-\frac{\pi}{2}, \frac{\pi}{2})$ whose tangent is 1. Answer: $\frac{\pi}{4}$.
How to solve $\sin(\arccos(x))$?
Let $\theta = \arccos(x)$. Then $\cos(\theta) = x$. Draw a right triangle, find the missing side using the Pythagorean theorem, and then find $\sin(\theta)$.
Evaluate $\tan(\arcsin(\frac{3}{5}))$
Let $\theta = \arcsin(\frac{3}{5})$. Then $\sin(\theta) = \frac{3}{5}$. Draw a right triangle, find the adjacent side using the Pythagorean theorem (which is 4), and then find $\tan(\theta) = \frac{3}{4}$.
Evaluate $\cos(\arctan(2))$
Let $\theta = \arctan(2)$. Then $\tan(\theta) = 2$. Draw a right triangle, find the hypotenuse using the Pythagorean theorem (which is $\sqrt{5}$), and then find $\cos(\theta) = \frac{1}{\sqrt{5}}$.
Define arcsine.
The inverse function of sine; finds the angle whose sine is a given value.
Define arccosine.
The inverse function of cosine; finds the angle whose cosine is a given value.
Define arctangent.
The inverse function of tangent; finds the angle whose tangent is a given value.
What does $\sin^{-1}(x)$ represent?
The angle whose sine is x.
What does $\cos^{-1}(x)$ represent?
The angle whose cosine is x.
What does $\tan^{-1}(x)$ represent?
The angle whose tangent is x.