(1+sinA)^2+(1-sinA)^2/cos^2A = 2(1+sin^2A)/(1-sin^2A)

Dear student
1+sinA2+1-sinA2cos2A=1+sin2A+2sinA+1+sin2A-2sinA1-sin2A=21+sin2A1-sin2A
Regards

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