Tìm x biết : `1+2+3+...+x=68`

• dongha8284
• Chưa có nhóm

• Trả lời

  1727

• Điểm

  310

• Cảm ơn

  1708

Since $\cos^2 \alpha$ is equal to $\left (\frac{-12}{13}\right)^2$, we can substitute that value into the expression. Hence, we have \sqrt{1-\cos^2 \alpha} = \sqrt{1-\left (-\frac{12}{13}\right)^2}. Simplifying further, we have \sqrt{1-\cos^2 \alpha... xem thêm