2+sin+30度等于多少

居吉言1194计算;2sin30°+2cos60°+3tan45°=? -
乐委魏13482675522 ______ sin30°=1\2,cos60°=sin30°=1\2,tan45°=cot45°=1所以2sin30°+2cos60°+3tan45°=5

居吉言1194sin30度等于多少?
乐委魏13482675522 ______ sin30°=1/2 cos30°=根号3/2 tan30°=根号3/3 cot30°=根号3

居吉言11942sin30度+3cos60度—4tan45度+sin45度cos45度等于 -
乐委魏13482675522 ______ 解:2sin30°+3cos60°-4tan45°+sin45°cos45° =2*(1/2)+3*(1/2)-4*1+(1/√2)(1/√2) =1+3-4+1/2 =1/2.

居吉言11942sin(30°+α)会不会等于sin2(30°+α)
乐委魏13482675522 ______ 令 2sin(30°+α) = sin2(30°+α) = 2sin(30°+α)cos(30°+α) sin(30°+α)=0 或者 cos(30°+α)=1 α = -30° + 2nPI

居吉言11942sin30度除(tg60度+tg45度)等于? -
乐委魏13482675522 ______ 2sin30度除(tg60度+tg45度)=2*1/2÷(√3+1)=1/(√3+1)=(√3-1)/2

居吉言11942010乘以6加二分之一加sin30度等于多少?
乐委魏13482675522 ______ 2010X6+1/2+sin30=12060+1/2+1/2=12061

居吉言1194sin(30度+30度+45度)等于多少? -
乐委魏13482675522 ______[答案] sin(30度+30度+45度) =sin(60+45) =sin60cos45+sin45cos60 =√3/2*√2/2+√2/2*1/2 =(√6+√2)/4

居吉言11942cos60度加sin30度加根号3cot60度等于多少 -
乐委魏13482675522 ______ 2cos60°+sin30°+√3cot602*1/2+1/2+√3*√3/3=1+1/2+1=2.5

居吉言11942sin30度是多少? -
乐委魏13482675522 ______ 2sin30度=2*1/2=1