(1) 定义域为一切实数;
(2)
fx =cosxtanx +3sin的平方x +13/12
=sinx+3sin平方x+13/12
=3(sin平方x+1/3sinx)+13/12
=3(sinx+1/6)平方+1
最小值=1
最大值=3×(1+1/6)平方+1
=4+13/12
=61/12
(1) 定义域为一切实数;
(2)
fx =cosxtanx +3sin的平方x +13/12
=sinx+3sin平方x+13/12
=3(sin平方x+1/3sinx)+13/12
=3(sinx+1/6)平方+1
最小值=1
最大值=3×(1+1/6)平方+1
=4+13/12
=61/12