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shutvik [7]
2 years ago
13

Please help! maths functions

Mathematics
1 answer:
arsen [322]2 years ago
4 0

1. I'm not sure how you're expected to "read off" where they intersect based on an imprecise hand-drawn graph, but we can still find these intersections exactly.

2\sin(x) = 3 \cos(x)

\dfrac{\sin(x)}{\cos(x)} = \dfrac32

\tan(x) = \dfrac32

x = \tan^{-1}\left(\dfrac32\right) + 180^\circ n

where n is an integer.

In the interval [0°, 360°], we have solutions at

x \approx 56.31^\circ \text{ or } x \approx 236.31^\circ

From the sketch of the plot, we do see that the intersections are roughly where we expect them to be. (The first is somewhere between 45° and 90°, while the second is somewhere between 225° and 270°.)

2. According to the plot and the solutions from (1), we have

3 \cos(x) > 2 \sin(x)

whenever 0^\circ < x < 56.31^\circ or 236.31^\circ < x < 360^\circ.

3. Rewrite the inequality as

2 \sin(x) - 3 \cos(x)  \le 0 \implies 3 \cos(x) \ge 2 \sin(x)

The answer to (1) tells us where the equality 3\cos(x) = 2\sin(x) holds.

The answer to (2) tells us where the strict inequality 3\cos(x)>2\sin(x) holds.

Putting these solutions together, we have 2\sin(x) - 3\cos(x) \le 0 whenever 0^\circ < x \le 56.31^\circ or 236.61^\circ \le x < 360^\circ.

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