cos^2 15°—sin^2 15°=?
2个回答
cos^2 15°—sin^2 15°
=cos2(15°)
=cos30°
=√3/2
公式:(cosa)^2-(sina)^2=cos2a
相关问题
cos^2 15°-sin^2 15°=
化简:sin^2(75°)*cos^2(15°)-cos^2(75°)*sin^2(15°)
化简:sin^2(75°)*cos^2(15°)-cos^2(75°)*sin^2(15°)
(sin13°+cos15°sin2°)/(cos13°-sin15°sin2°)的值为
(cos^2)15°-(sin^2)15等于多少
[sin15°−cos15°/sin15°+cos15°]=______.
sin62°cos28°-cos118°sin152°= cos15°-sin15°/cos15°+sin15°=
sin^2 15°-cos^2 15°的值是
根号3/2cos15°-1/2sin15°
sin^2(15°)-cos^2(15°)的值为