题目内容
(1)tan(a+20°)= (2)tan2a-4tana+=0
求适合下列各式的锐角:
2sinα=1;
tan2α-(1+)tanα+=0;
求适合下列各式的锐角α.
(1)cosα=;
(2)2sin(α+10°)=;
(3)(sinα-)(cosα-)=0.