Question 741616
Determine the values of theta, 0 (less than of equal to) theta < 2pi, for which tan(theta) = -[radical]sec^2(theta)-1 is true.
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{{{tan(x)=-sqrt(sec^2(x)-1)}}}
start with right side
{{{-sqrt(sec^2(x)-1)}}}
Identity: {{{tan^2(x)=sec^2(x)-1}}}
{{{-sqrt(sec^2(x)-1)=-sqrt(tan^2(x))=tan(x)}}}