if tan A=24/7 and 180°
来源:学生作业帮 编辑:作业帮 分类:综合作业 时间:2024/05/14 01:10:58
if tan A=24/7 and 180°
-3/5
再问: 过程能写出来吗?摆脱啦~
再答: tan is opposite over adjacent, so we can let opposite = 24 and adjacent = 7 but since the angle is in quadrant 3, so opposite = -24 and adjacent = -7 due to pythagorean theorem, hypotenuse = 25. so, cos(A) = adjacent over hypotenuse = -7/25 double-angle formula: cos(x) = 2cos(x/2)^2-1 so: cos(A/2)^2 = (cos(A)+1)/2 = 9/25 so: cos(A/2) = 3/5 or -3/5 since 180°
再问: 过程能写出来吗?摆脱啦~
再答: tan is opposite over adjacent, so we can let opposite = 24 and adjacent = 7 but since the angle is in quadrant 3, so opposite = -24 and adjacent = -7 due to pythagorean theorem, hypotenuse = 25. so, cos(A) = adjacent over hypotenuse = -7/25 double-angle formula: cos(x) = 2cos(x/2)^2-1 so: cos(A/2)^2 = (cos(A)+1)/2 = 9/25 so: cos(A/2) = 3/5 or -3/5 since 180°
if tan A=24/7 and 180°
if tan(1/2)x=2/5 and
化简:sin(180°+a)-tan(-a)-tan(360°+a)/tan(a+180°)+cos(-a)+cos(a
sin^2(-a)-tan(360-a)tan(-a)-sin(180-a)cos(360-a)tan(180+a)=
为什么 3.sin(-α)=-sina cos(-a)=cosα 4*.tan(180°+α)=tanα tan(-α)
tan(180-A-B=)
tan(90°-a)=-tana是吗?
求证tan(360°-a)=-tana
tan(A+90°)=-1/tanA
tan(27*-a)tan(49*-a)tan(63*+a)tan(139*-a)=?化简求值!
IF A'EVENT AND A='1'THEN是什么意思?
if a and b are both positive intergers and a平方-b平方=7 .what i