几道简单的高中数学的英文题求解!!!(要详细过程,谢谢)
1.Iftan4x=2cot4xand0≤x≤180°,thenx=(A)13.7°(B)54.7°(C)13.7°and76.3°(D)13.7°and103.7°(E)13.7°,76.3°,103.7°,and166.3°
2.If12sin2x+sinx−1=0overtheinterval180°≤x≤360°,thenx=(A)14.5°(B)−19.5°(C)194.5°or344.5°(D)199.5°(E)199.5°or340.5°
3.Theproductof45,454,545,454,545and1,234containshowmanydigits?(A)14(B)15(C)16(D)17(E)184.Whichofthefollowingdescribestherightandleftbehaviorofthegraphoff(x)=−3x7+2x5−3x+6?(A)Risesrightandleft(B)Fallsrightandleft(C)Fallsleft,risesright(D)Risesleft,fallsright(E)Cannotbedetermined
5.Theexpression(x^2+3x-4)/(2x^2+10x+8)isundefinedforwhatvalueofx?
A.x={-1,-4}
B.x={-1}
C.x={0}
D.x={1,-5}
E.x={0,1,4}