1.下列各式中正确的是( )A.arc sin (-0.5) = arc cos [(√3)/2]B.arc cos(-0.5)= arc sin [(√3)/2]C.arc tan (-1) = arc sin (-1 )D.arc sin [- (√2)/2] = -arc cos [(√2)/2]2.已知偶函数f (x)在[-1,0]上是单调递减的,又
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![1.下列各式中正确的是( )A.arc sin (-0.5) = arc cos [(√3)/2]B.arc cos(-0.5)= arc sin [(√3)/2]C.arc tan (-1) = arc sin (-1 )D.arc sin [- (√2)/2] = -arc cos [(√2)/2]2.已知偶函数f (x)在[-1,0]上是单调递减的,又](/uploads/image/z/1747207-55-7.jpg?t=1.%E4%B8%8B%E5%88%97%E5%90%84%E5%BC%8F%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EF%BC%88+%EF%BC%89A.arc+sin+%28-0.5%29+%3D+arc+cos+%5B%EF%BC%88%E2%88%9A3%EF%BC%89%2F2%5DB.arc+cos%EF%BC%88-0.5%EF%BC%89%3D+arc+sin+%5B%EF%BC%88%E2%88%9A3%EF%BC%89%2F2%5DC.arc+tan+%28-1%29+%3D+arc+sin+%28-1+%29D.arc+sin+%5B-+%28%E2%88%9A2%29%2F2%5D+%3D+-arc+cos+%5B%28%E2%88%9A2%29%2F2%5D2.%E5%B7%B2%E7%9F%A5%E5%81%B6%E5%87%BD%E6%95%B0f+%28x%29%E5%9C%A8%5B-1%2C0%5D%E4%B8%8A%E6%98%AF%E5%8D%95%E8%B0%83%E9%80%92%E5%87%8F%E7%9A%84%2C%E5%8F%88)
1.下列各式中正确的是( )A.arc sin (-0.5) = arc cos [(√3)/2]B.arc cos(-0.5)= arc sin [(√3)/2]C.arc tan (-1) = arc sin (-1 )D.arc sin [- (√2)/2] = -arc cos [(√2)/2]2.已知偶函数f (x)在[-1,0]上是单调递减的,又
1.下列各式中正确的是( )
A.arc sin (-0.5) = arc cos [(√3)/2]
B.arc cos(-0.5)= arc sin [(√3)/2]
C.arc tan (-1) = arc sin (-1 )
D.arc sin [- (√2)/2] = -arc cos [(√2)/2]
2.已知偶函数f (x)在[-1,0]上是单调递减的,又α、β是锐角三角形的两个内角,则( )
A.f(sinα)>f(cosβ)
B.f(sinα) f(sinβ)
D.f(cosα)> f(cosβ)
3.设函数y=f(x)的定义域为R,则函数 y=f(x-1)与y=f(1-x)的图象关于( )对称.
A.直线y=0 B.直线x=0 C.直线y=1 D.直线x=1
1.下列各式中正确的是( )A.arc sin (-0.5) = arc cos [(√3)/2]B.arc cos(-0.5)= arc sin [(√3)/2]C.arc tan (-1) = arc sin (-1 )D.arc sin [- (√2)/2] = -arc cos [(√2)/2]2.已知偶函数f (x)在[-1,0]上是单调递减的,又
1.arc sin (-0.5) =-π /6,arc cos [(√3)/2]= π /6
arc cos(-0.5)= 2π/3,arc sin [(√3)/2] =π/3
arc tan (-1) =-π/4,arc sin (-1 ) ==-π/2
故选D
2.α、β是锐角三角形的两个内角,
所以α+β>90,α>90-β
sinα>sin(90-β)=cosβ>0,0