cos²A+tan²A-1/sin²A=tan²A
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=>>cos^2A-1 +tan^2A/sin^2A
=>>-sin^2A+tan^2A/sin^2A
=>> -sin^2Acos^2A+sin^2A/sin^2Acos^2A
=>>-sin^2A(cos^2A-1)/sin^2Acos^2A
=>> -sin^2A×-sin^2A/cos^2Asin^2A
=>> sin^4A/sin^2Acos^2A
=>> sin^2A/cos^2A
=>> tan^2A
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