# calc

2sec^2x - 3tanx - 5 = 0
I got

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1. trying one of them
my calculator is set for degrees
using 4.38 rad = 251 degrees
sec 251 = -3.07
2 sec^2 251 = 18.87

tan 251 = 2.9
-3 tan 251 = -8.71

18.87 -8.71 - 5 = 5.15

hmmm :(

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2. 2sec^2x - 3tanx - 5 = 0
2 + 2tan^2x - 3tanx - 5 = 0
2tan^2x - 3tanx - 3 = 0
tanx = (3±√33)/4 = -0.686, 2.1861
x = -0.601+nπ, 1.142+nπ
So, I get
x = 1.142, 2.541, 4.283, 5.682

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