solve 1 + secA upon sec A is equals to sin square A
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(1+secA)/secA=sin^2 (A)
1/secA +secA/secA =sin^2 (A)
cosA+1=sin^2 (A)
cosA+1-sin^2 (A)=0
cosA+cos^2 (A)=0
cosA (1+cosA)=0
cosA=0
cosA=pi/2
A=2npi+pi/2
A=2npi-pi/2npi
OR
1+cosA=0
cosA= -1
cos A=pi
A=2npi+pi
A=2npi-pi