Let us show that cosec²22°cot²68° = sin²22° + sin²68° + cot²68°

5

Let us show that sec²12° -

6

∠A + ∠B = 90°, let us show that

8

If ∠A + ∠B = 90°, let us show that,

9

Let us prove that cot 12°cot38° cot ° cot52° cot 78° cot 60° =