问题描述:
(1)下列等式中正确的一组是
A.cos45°<cos90°<cos135° B.cos45°>cos90°>cos135°
C.cos45°<cos135°<cos90° D.cos45°>cos135°>cos90°
(2)cos(-19/4π)+cos5/6π
(3)若f(x)=ax+bsinx=1(a,b为常数)满足f(5)=7,求f(-5)的值
第三题是 若f(x)=ax+bsinx+1(a,b为常数)满足f(5)=7,求f(-5)的值
A.cos45°<cos90°<cos135° B.cos45°>cos90°>cos135°
C.cos45°<cos135°<cos90° D.cos45°>cos135°>cos90°
(2)cos(-19/4π)+cos5/6π
(3)若f(x)=ax+bsinx=1(a,b为常数)满足f(5)=7,求f(-5)的值
第三题是 若f(x)=ax+bsinx+1(a,b为常数)满足f(5)=7,求f(-5)的值
问题解答:
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