Rút gọn các biểu thức sau :
a) A 3sin(11pi -x) sin(frac{5pi}{2}-x) +2sin(9pi+x)
b) Bsin(1980^o+x)-cos(90^o -x)+tan(270^o-x) +cot (360^o -x)
c) C-2sin(frac{-5pi}{2}+x)-3cos(3pi-x)+5sin(frac{7pi}{2}-x)+cot(frac{3pi}{2}-x)
d) Dtan(x-pi) cos (x-frac{pi}{2})cos(x+pi)
e) Ecos(frac{115pi}{2}-x)+sin(x-frac{235pi}{2})+cos(x-frac{187pi}{2})+sin(frac{143pi}{2}-x)
f) F cot(x-107pi) cos(x-frac{303pi}{2})+cos(x+1008pi)-3sin(x-1019pi)
g) Gcot(19pi-x)+cos(x-37pi)+sin(-frac{31pi}{2}-x)+tan(x-frac{47pi}{2}...
Đọc tiếp
Rút gọn các biểu thức sau :
a) A= 3sin(11\(\pi\) -x) sin(\(\frac{5\pi}{2}-x\)) +2sin(9\(\pi\)+x)
b) B=sin(1980\(^o\)+x)-cos(90\(^o\) -x)+tan(\(270^o-x\)) +cot (360\(^o\) -x)
c) C=-2sin(\(\frac{-5\pi}{2}\)+x)-3cos(3\(\pi\)-x)+5sin(\(\frac{7\pi}{2}\)-x)+cot(\(\frac{3\pi}{2}\)-x)
d) D=tan(x-\(\pi\)) cos (x-\(\frac{\pi}{2}\))cos(x+\(\pi\))
e) E=cos(\(\frac{115\pi}{2}-x\))+sin(\(x-\frac{235\pi}{2}\))+cos(x-\(\frac{187\pi}{2}\))+sin(\(\frac{143\pi}{2}-x\))
f) F= cot(x-\(107\pi\)) cos(x-\(\frac{303\pi}{2}\))+cos(x+1008\(\pi\))-3sin(x-1019\(\pi\))
g) G=cot(19\(\pi\)-x)+cos(x-37\(\pi\))+sin(\(-\frac{31\pi}{2}-x\))+tan(x-\(\frac{47\pi}{2}\))
h) H=cos(1170\(^o\)+x)+2sin(x-540\(^o\))-tan(630\(^o\)+x) cot(810\(^o\)-x)
i) I=\(\frac{sin\left(\pi-x\right)cos\left(x-\frac{9\pi}{2}\right)tan\left(9\pi+x\right)}{cos\left(7\pi-x\right)sin\left(\frac{7\pi}{2}-x\right)cot\left(x-\frac{17\pi}{2}\right)}\)
