sin^2 ( x ) - cos^2 ( x )

Câu Hỏi Thường Gặp

• Dung dịch \(\sin^{2}{\left ( x \right )} - \cos^{2}{\left ( x \right )}\)

  

  $$-\cos \left(2x\right)$$

• Hệ số \(\sin^{2}{\left ( x \right )} - \cos^{2}{\left ( x \right )}\)

  

  $$\left(\sin \left(x\right)+\cos \left(x\right)\right)\left(\sin \left(x\right)-\cos \left(x\right)\right)$$