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Solve trig equation:: stuck?
Solve 4tan² (x) - 4sin (x) = 1
Must be something I'm missing. Here's what I have:
4[sin²(x)/cos²(x)] - 4sin(x) - 1 = 0
Multiplying by cos²(x)
4sin²(x)-4sin(x)cos²(x) - cos²(x) = 0
4sin^3(x)+5sin²(x)-4sin(x)-1 = 0
Ugly cubic....What to do here?
If you think this is impossible or extremely difficult to solve, pls. let me know as I was wondering if I should use a graphics calculator for this.
1 Answer
- vectLv 71 decade agoFavorite Answer
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continue and use graphic calculator
sinx=-1.49,-0.206,0.698
x=-11.9,+360k,191.9+360k,44.3+360k,
135.7+360k
