P.t. (sec A + tan A)square = 1 + sin A upon 1-sin A
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(secA+tanA)² =1+sinA/1-sinA
(1/cosA + sinA/cosA)² = RHS
(1+sinA/cosA)² = RHS
(1+sinA)² /cosA² =RHS
(1+sinA)² /1-sinA² =RHS
(1+sinA)(1+sinA)/ (1-sinA)(1+sinA) = RHS
1+sinA/1-sin = RHS
(1/cosA + sinA/cosA)² = RHS
(1+sinA/cosA)² = RHS
(1+sinA)² /cosA² =RHS
(1+sinA)² /1-sinA² =RHS
(1+sinA)(1+sinA)/ (1-sinA)(1+sinA) = RHS
1+sinA/1-sin = RHS
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