问题描述:
已知sinα是方程5x^2-7x-6=0的根,求下面式子的值.求详解,
[sin(-α-3π/2)sin(3π/2-α)*tan ^2(2π-α)]/[cos(π/2-α)cos(π/2 +α)cos(π-α)]
说明:斜杠左边中括号是分子;右边是分母;分子和分母的式子各自都是相乘关系.
[sin(-α-3π/2)sin(3π/2-α)*tan ^2(2π-α)]/[cos(π/2-α)cos(π/2 +α)cos(π-α)]
说明:斜杠左边中括号是分子;右边是分母;分子和分母的式子各自都是相乘关系.
问题解答:
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