tana (cosa -sina )+(sina +tana )/(1/tana +1/sina )该如何化简
tana (cosa -sina )+(sina +tana )/(1/tana +1/sina )该如何化简
为什么sina+cosa/sina-cosa =tana+1/tana-1
(cosa-sina)/(cosa+sina)=(1-tana)/(1+tana)
化简根号下(1)2-2sina-cos^2 a (2)tana(cosa-sina)+[(sina+tana)/(cot
求证1+sina-cosa/1+sina+cosa=tana/2
已知tana=2,求值:(1)cosa+sina/cosa-sina
已知tana>1且sina+cosa
求证tana/2=sina/1+cosa
(1+sina)/cosa=(1+tana/2)/(1-tana/2)
sina-cosa=1/2 求tana/2和tana
已知1/tana+tana=2求sina+cosa
证明; (1) / (tana) + (sina) /(1+cosa) = (1) /(sina)