cos^2A+sin^2A=1
sin^2A=1-(3√ 11/5)^2
sin^2A=1-99/25
sin^2A=-74/25
A∉R
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cos^2A+sin^2A=1
sin^2A=1-(3√ 11/5)^2
sin^2A=1-99/25
sin^2A=-74/25
A∉R