## Algebra and Trigonometry 10th Edition

False. It is a conditional equation. In an identity the equation is true for any $θ$ in the domain of the equation.
Test another value of $θ$ $sin^2θ+cos^2θ=1+tan^2θ$ $sin^2(60°)+cos^2(60°)=1+tan^2(60°)$ $\frac{3}{4}+\frac{1}{4}=1+3$ $1=4$ False.