sin^2Acos^2A+cos^2Atan^2A=1
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sin2acos2a+cos2atan2a=1
sin2acos2a+sin2a=1
sin2a(cos2a+1)=1
(1-cos2a)(1+cos2a)=1
1-cos^4a=1
cosa=0
note: used notation 2a for ^2a
sin2acos2a+sin2a=1
sin2a(cos2a+1)=1
(1-cos2a)(1+cos2a)=1
1-cos^4a=1
cosa=0
note: used notation 2a for ^2a
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