Verify the identity: tan2(θ)+1=sec2(θ)\tan^2(\theta) + 1 = \sec^2(\theta)tan2(θ)+1=sec2(θ).
True only when tan(θ)>0\tan(\theta) > 0tan(θ)>0
False; the identity is tan2(θ)=sec2(θ)−1\tan^2(\theta) = \sec^2(\theta) - 1tan2(θ)=sec2(θ)−1
True only when θ\thetaθ is in quadrant I
True for all θ\thetaθ where tangent is defined