一道数学题!!
若sina*cosa=1/2,则tana+cosa/sina的值是_____.
参考答案:tana+cosa/sina
=sina/cosa+cosa/sina
=(sin^2a+cos^2a)/(sina*cosa)
=1/(sina*cosa)
=2
注:关键考你sin^2a+cos^a=1
若sina*cosa=1/2,则tana+cosa/sina的值是_____.
参考答案:tana+cosa/sina
=sina/cosa+cosa/sina
=(sin^2a+cos^2a)/(sina*cosa)
=1/(sina*cosa)
=2
注:关键考你sin^2a+cos^a=1