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(cos²α+cos²α)(cos²α +1) = csc²α+cot²α-1
sen²α
(cos²α+(1-sen²α))(cos²α+sen²α) = csc²α+cot²α-1
sen²α
(cos²α+(1-senα)) ( 1 ) = csc²α+cot²α-1
sen²α
(cos²α+(1-sen²α))(csc²α) = csc²α+cot²α-1
cos²α(csc²α) + 1(csc²α) -sen²α(csc²α) = csc²α+cot²α-1
cos²α( 1 ) + csc²α - sen²α( 1 ) = csc²α+cot²α-1
sen²α sen²α
cos²α + csc²α -1 = csc²α+cot²α-1
sen²α
cot²α+csc²α-1 = csc²α+cot²α-1
csc²α+cot²α-1 = csc²α+cot²α-1