Sin^2 45°+cos^2 45°=?
2个回答
sin45°=√2/2, cos45°=√2/2.
sin^2 45°+cos^2 45°
=(√2/2)^2+(√2/2)^2
=1
相关问题
1.cos30°-sin45°/sin60°-cos45° 2.(sin30^2)30°+2sin60°+tha45°-
cos60°+tan60° 2/根号2sin45°+sin60°-2cos45°
计算:cos45°.tan45°+ .tan30°-2cos60°.sin45°
2sin30°-3sin45°×cos45°+4cos60°
根号2*sin45度+sin30度-2*cos45度
(1)cos60°-sin^2 45°+sin^2 45°+1/4tan^2 30°+cos30°-sin30°
物理 解方程问题!1.T1sin45* + T2sin45*=2mg (1)T2cos45* -T2cos45*=mg
cos45°•tan45°+ 根号3.tan30°-2cos60°•sin45°
cos(45+30)cos(45-30)+sin(45+30)sin(45-30=)
2sin30°-3tan45°·cos45°+4cos60°