(1-tan^4A)cos^2A+tan^2A=1
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(1-tan^4A)cos^2A+tan^2A=1(1-tan^4A)cos^2A+tan^2A=1(1-tan^4A)cos^2A+tan^2A=11-tan^4A=(1-tan²A)(1
(1-tan^4A)cos^2A+tan^2A=1
(1-tan^4A)cos^2A+tan^2A=1
(1-tan^4A)cos^2A+tan^2A=1
1-tan^4A=(1-tan²A)(1+tan²A)
1+tan²A=(cos²A+sin²A)/cos²A=1/cos²A
(1-tan^4A)cos^2A+tan^2A=(1-tan²A)+tan²A=1
(1-tan^4A)cos^2A+tan^2A=1
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