用R程序编程求下列的值，正确的命令是 （ ）[img=76x44]180398c776266cb.jpg[/img]
A: (sin(50*180/pi))^2/(1+ sin(10*180/pi))
B: (sin(50*π/180))^2/(1+ sin(10*π/180))
C: sin(50)^2/(1+ sin(10))
D: (sin(50*pi/180))^2/(1+ sin(10*pi/180))
A: (sin(50*180/pi))^2/(1+ sin(10*180/pi))
B: (sin(50*π/180))^2/(1+ sin(10*π/180))
C: sin(50)^2/(1+ sin(10))
D: (sin(50*pi/180))^2/(1+ sin(10*pi/180))
举一反三
- 角度x=[30, 60, 90]，计算其正弦函数的运算为 A: SIN(x*pi/180) B: SIN(x) C: sin(x) D: sin(x*pi/180)
- 8. 下列不等式正确的是 A: $0\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}$ B: $0\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}$ C: $\int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}\lt 0\lt \int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}$ D: $\int_{0}^{\frac{\pi }{2}}{\cos (\sin x)dx}\lt 0\lt \int_{0}^{\frac{\pi }{2}}{\sin (\sin x)dx}$
- 【单选题】MATLAB 中,当x和y为向量时,表达式书写正确的是() A. (cos(abs(x+y))-sin(78*pi/180))./x ； B. (cos(abs(x+y))-sin(78*pi/180))/x ； C. (cos(abs(x+y))-sin(78))./x ； D. (cos(abs(x+y))-sin(78))/x ；
- 函数绘图命令使用正确的是 A: fplot('sin(x)',[0,2*pi],'r') B: fplot('x*sin(x)',[0,2*pi],r) C: fplot(‘[sin(x),cos(x)]’,[0,2*pi]) D: plot('x^2',[0,2*pi],'r')
- 函数$f(x)=\arcsin(\sin x)$的傅里叶级数展开式为 A: $x$ B: $$\frac{4}{\pi}\sum_{n=0}^{\infty}\frac{(-1)^n\sin(2n+1)x}{(2n+1)^2}$$ C: $$\frac{4}{\pi}\sum_{n=1}^{\infty}\frac{(-1)^n\sin(2n+1)x}{(2n+1)^2}$$ D: $$\frac{4}{\pi}\sum_{n=1}^{\infty}\frac{(-1)^{n-1}\sin(2n+1)x}{(2n+1)^2}$$