[" 9."tan^(2)alpha+2tan alpha" ,tana bet...

[" 9."tan^(2)alpha+2tan alpha" ,tana beta "=tan^(2)beta+2tan beta." tanza,if "],[[" (A) "tan^(2)alpha+2tan alpha," tanz "beta=0," (B) "tan alpha+" t "],[" (C) "tan^(2)beta+2tan beta,tan2 alpha=1," (D) "tan alpha=tan]]

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[" 9."tan^(2)alpha+2tan alpha" ,tana beta "=tan^(2)beta+2tan beta." tanza,if "],[[" (A) "tan^(2)alpha+2tan alpha," tanz "beta=0," (B) "tan alpha+" t "],[" (C) "tan^(2)beta+2tan beta,tan2 alpha=1," (D) "tan alpha=tan]]

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