( )2.A.magazine B.piane C.cabbage D.back 选出画线部分发音不同的单词 画线a

a magazine My father ____ a magazine nowA.read B.is reading ( )2.A.magazine B.piane C.cabbage D.back 选出画线部分发音不同的单词 画线a 下列区间中,是函数y=xcosx-sina的单调递增区间为A.(pi /2,3pi/2)B.(pi,2pi)C.(3pi/2,5pi /2)D.(2pi ,3pi) cos(pi-a)=b,-1 read a magazine read a magazine是什么意思? read a magazine音标 a,b∈（3pi/4,pi）,sin(a+b)=-3/5,sin(b-pi/4)=12/13,则cos（a+pi/4）= 已知a,b,属于（3pi/4,pi),sin(a+b)=-3/5,sin(b-pi/4)=12/13,则cos(a+pi/4)=? (PI表示圆周率)若角B属于[0,2PI],且根号(1-cos^2角B)+根号(1-sin^2角B)=sin角B-cos角B,则B的取值范围是()A.[0,PI/2]b.[PI/2,PI]C[PI,PI/2]D[3PI/2,2PI] magazine magazine , magazine 求pi问题c语言#include#includevoid main(){ int a, b ; double pi=0; for(a=1, b=3;fabs(pi)>1e-6;a=a+4, b=b+4) { pi = pi + (1/a + 1/b); } pi = pi * 4; printf(%10.6lf, pi); getchar(); } 已知a,b属于（Pi/2,Pi),cosa+sin>0,则有（） A、a+b3Pi/2 C、a+b=3pi/2 D、a+b He was sleeping___she was reading a magazine. A.He was sleeping___she was reading a magazine. A.until B.before C.after D.while My mother works __ a magazine .She is a reporter.A.for B.at