tan²30°+2sin60°Xcos45°+sin30°Xcos30°

来源：学生作业帮助网编辑：六六作业网时间：2024/11/27 16:33:16

tan²30°+2sin60°Xcos45°+sin30°Xcos30°tan²30°+2sin60°Xcos45°+sin30°Xcos30°tan²30°+2sin6

tan²30°+2sin60°Xcos45°+sin30°Xcos30°
tan²30°+2sin60°Xcos45°+sin30°Xcos30°

tan²30°+2sin60°Xcos45°+sin30°Xcos30°
∵tan30º=√3,sin60º=(√3)/2,cos45º=(√2)/2,sin30º=1/2,cos30º=(√3)/2
∴tan²30°+2sin60°Xcos45°+sin30°Xcos30°=(√3)²+2×(√3)/2×(√2)/2+1/2×(√3)/2=3+(√6)/2+(√3)/4鐧惧害鍦板浘