tan(π2+x)\tan \left(\frac{\pi}{2}+x\right)tan(2π+x)
tan(π2+x2)\tan \left(\frac{\pi}{2}+\frac{x}{2}\right)tan(2π+2x)
tan(π4+x2)\tan \left(\frac{\pi}{4}+\frac{x}{2}\right)tan(4π+2x)
tan(π4+x)\tan \left(\frac{\pi}{4}+x\right)tan(4π+x)