sin^2 30度-cos^230度-tan45度

sin^2 30度-cos^230度-tan45度 sin(α+30度)+cos(α+60度)/2cosα=? 用matlab解决多元方程组问题a*cos(b)*t)^2+(1670-a*sin(b)*t)^2=57*571/2*a*cos(b)*t^2=12000','356000=1670*t-1/2*a*sin(B)*t^2(sin(b))^2+(cos(b))^2=1b是0到90度这三个方程组怎么求解啊 sin(30度+x/2)=cos什么转变成cos等于什么 求sin^2(t)*cos^4(t)dt的不定积分 matlab中怎么对下面的程序进行二维插值并画出三维视图呢?[x,y]=meshgrid(-2:1:2);t=2;Z=[(sin(t))^3 t^2 sin(t) cos(t) (sin(t))^2;t^2 sin(t) (cos(t))^4 cos(t) (sin(t))^2;t sin(t) cos(t) t^2 (sin(t))^2;sin(t) (cos(t))^3 t^2 (sin(t))^2 -2 sin 2t / cos t 为什么等于-4sin t cos(cos(t))-cos(sin(t)) 周期怎么求 若sin(270度+θ)=2cos(90度+θ),则cos^2+sinθcosθ-sin^2θ的值为 MatLab的程序问题ezplot(@(t)cos(t),@(t)sin(t),[0,2*pi]) (sin t) / ( 1-cos t)= cos^3+sin^3 求化简设t=cos+sin 化简：[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)].请大家解释一下.[cos(a+15度)]^2+[sin(a-15度)]^2+[sin(a+180度)]*[cos(a-180度)]=[cos(2a+30)+1]/2+[1-cos（2a-30)]/2+1/2sin2a=1+[cos(2a+30)-cos(2a-30)]/2+1/2sin2a=1-2si cos(2x+60`)cos(x-30`)+sin(2x+60`)sin(x-30`)=1/2求这题的题解...60` 是60度. 求sin cos tan 30 45 60 90 反正到180度的值,如sin 30是2/1 cos^2 80度 sin^2 50度-sin190cos320= sin^2 22.5度-cos^2 22.5度= tan sin cos 30 60度怎么算