Asked by Kiki

The number of values in the interval –π ≤ x ≤ π that satisfy the equation sin x = 2 cos x is

1
2
3
4
0
Answered by Steve
sinx = 2cosx
tanx = 2

tanx > 0 in QI or QIII, so there are two values for x.

Verify this at

http://www.wolframalpha.com/input/?i=solve+sinx+%3D+2cosx
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