sina+cosa=根号2
平方
sin²a+cos²a+2sinacosa=2
1+2sinacosa=2
sinacosa=1/2
tana+1/tana
=sina/cosa+cosa/sina
=(sin²a+cos²a)/sinacosa
=1/(1/2)
=2
sina+cosa=根号2
平方
sin²a+cos²a+2sinacosa=2
1+2sinacosa=2
sinacosa=1/2
tana+1/tana
=sina/cosa+cosa/sina
=(sin²a+cos²a)/sinacosa
=1/(1/2)
=2