If traiangle ABC is a right triangle and if ∠A=π2 ,then prove that cos2 B+cos2 C = 1

If traiangle ABC is a right triangle and if $∠ A = \frac{π}{2}$ ,then prove that $\cos^{2} B + \cos^{2} C = 1$

Matching exercise

Match the items on the right to the items on the left.

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