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
    use quadratic formula
    y=(-1±√(5))/2
    or
    tan(x)=(-1±√(5))/2
    find tan-1(-1±√(5))/2 using your calculator.

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