# Trigonometry

Solve tan2 x + tan x – 1 = 0 for the principal value(s) to two
decimal places.

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1. * Solve tan^2x + tanx-1=0 for the principal value(s) to two decimal places.

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2. Let y=tan(x)
y²+y-1=0
y=(-1±√(5))/2
or
tan(x)=(-1±√(5))/2
find tan-1(-1±√(5))/2 using your calculator.

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