三角学 示例

展开三角式 (1+sin(2x)+cos(2x))/(1+sin(2x)-cos(2x))
1+sin(2x)+cos(2x)1+sin(2x)-cos(2x)1+sin(2x)+cos(2x)1+sin(2x)cos(2x)
解题步骤 1
化简分子。
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解题步骤 1.1
使用正弦倍角公式。
1+2sin(x)cos(x)+cos(2x)1+sin(2x)-cos(2x)1+2sin(x)cos(x)+cos(2x)1+sin(2x)cos(2x)
解题步骤 1.2
使用倍角公式把 cos(2x)cos(2x) 转换为 2cos2(x)-12cos2(x)1
1+2sin(x)cos(x)+2cos2(x)-11+sin(2x)-cos(2x)1+2sin(x)cos(x)+2cos2(x)11+sin(2x)cos(2x)
解题步骤 1.3
11 中减去 11
0+2sin(x)cos(x)+2cos2(x)1+sin(2x)-cos(2x)0+2sin(x)cos(x)+2cos2(x)1+sin(2x)cos(2x)
解题步骤 1.4
002sin(x)cos(x)2sin(x)cos(x) 相加。
2sin(x)cos(x)+2cos2(x)1+sin(2x)-cos(2x)2sin(x)cos(x)+2cos2(x)1+sin(2x)cos(2x)
解题步骤 1.5
2sin(x)cos(x)+2cos2(x)2sin(x)cos(x)+2cos2(x) 中分解出因数 2cos(x)2cos(x)
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解题步骤 1.5.1
2sin(x)cos(x)2sin(x)cos(x) 中分解出因数 2cos(x)2cos(x)
2cos(x)(sin(x))+2cos2(x)1+sin(2x)-cos(2x)2cos(x)(sin(x))+2cos2(x)1+sin(2x)cos(2x)
解题步骤 1.5.2
2cos2(x)2cos2(x) 中分解出因数 2cos(x)2cos(x)
2cos(x)(sin(x))+2cos(x)(cos(x))1+sin(2x)-cos(2x)2cos(x)(sin(x))+2cos(x)(cos(x))1+sin(2x)cos(2x)
解题步骤 1.5.3
2cos(x)(sin(x))+2cos(x)(cos(x))2cos(x)(sin(x))+2cos(x)(cos(x)) 中分解出因数 2cos(x)2cos(x)
2cos(x)(sin(x)+cos(x))1+sin(2x)-cos(2x)2cos(x)(sin(x)+cos(x))1+sin(2x)cos(2x)
2cos(x)(sin(x)+cos(x))1+sin(2x)-cos(2x)2cos(x)(sin(x)+cos(x))1+sin(2x)cos(2x)
2cos(x)(sin(x)+cos(x))1+sin(2x)-cos(2x)2cos(x)(sin(x)+cos(x))1+sin(2x)cos(2x)
解题步骤 2
化简分母。
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解题步骤 2.1
使用正弦倍角公式。
2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)-cos(2x)2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)cos(2x)
解题步骤 2.2
使用倍角公式把 cos(2x)cos(2x) 转换为 2cos2(x)-12cos2(x)1
2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)-(2cos2(x)-1)2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)(2cos2(x)1)
解题步骤 2.3
运用分配律。
2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)-(2cos2(x))--12cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)(2cos2(x))1
解题步骤 2.4
22 乘以 -11
2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)-2cos2(x)--12cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)2cos2(x)1
解题步骤 2.5
-11 乘以 -11
2cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)-2cos2(x)+12cos(x)(sin(x)+cos(x))1+2sin(x)cos(x)2cos2(x)+1
解题步骤 2.6
1111 相加。
2cos(x)(sin(x)+cos(x))2+2sin(x)cos(x)-2cos2(x)2cos(x)(sin(x)+cos(x))2+2sin(x)cos(x)2cos2(x)
解题步骤 2.7
2+2sin(x)cos(x)-2cos2(x)2+2sin(x)cos(x)2cos2(x) 中分解出因数 22
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解题步骤 2.7.1
22 中分解出因数 22
2cos(x)(sin(x)+cos(x))2(1)+2sin(x)cos(x)-2cos2(x)2cos(x)(sin(x)+cos(x))2(1)+2sin(x)cos(x)2cos2(x)
解题步骤 2.7.2
2sin(x)cos(x)2sin(x)cos(x) 中分解出因数 22
2cos(x)(sin(x)+cos(x))2(1)+2(sin(x)cos(x))-2cos2(x)2cos(x)(sin(x)+cos(x))2(1)+2(sin(x)cos(x))2cos2(x)
解题步骤 2.7.3
-2cos2(x)2cos2(x) 中分解出因数 22
2cos(x)(sin(x)+cos(x))2(1)+2(sin(x)cos(x))+2(-cos2(x))2cos(x)(sin(x)+cos(x))2(1)+2(sin(x)cos(x))+2(cos2(x))
解题步骤 2.7.4
2(1)+2(sin(x)cos(x))2(1)+2(sin(x)cos(x)) 中分解出因数 22
2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x))+2(-cos2(x))2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x))+2(cos2(x))
解题步骤 2.7.5
2(1+sin(x)cos(x))+2(-cos2(x))2(1+sin(x)cos(x))+2(cos2(x)) 中分解出因数 22
2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x)-cos2(x))2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x)cos2(x))
2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x)-cos2(x))2cos(x)(sin(x)+cos(x))2(1+sin(x)cos(x)cos2(x))
解题步骤 2.8
移动 -cos2(x)cos2(x)
2cos(x)(sin(x)+cos(x))2(1-cos2(x)+sin(x)cos(x))2cos(x)(sin(x)+cos(x))2(1cos2(x)+sin(x)cos(x))
解题步骤 2.9
使用勾股恒等式。
2cos(x)(sin(x)+cos(x))2(sin2(x)+sin(x)cos(x))2cos(x)(sin(x)+cos(x))2(sin2(x)+sin(x)cos(x))
解题步骤 2.10
sin2(x)+sin(x)cos(x)sin2(x)+sin(x)cos(x) 中分解出因数 sin(x)sin(x)
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解题步骤 2.10.1
sin2(x)sin2(x) 中分解出因数 sin(x)sin(x)
2cos(x)(sin(x)+cos(x))2(sin(x)sin(x)+sin(x)cos(x))2cos(x)(sin(x)+cos(x))2(sin(x)sin(x)+sin(x)cos(x))
解题步骤 2.10.2
sin(x)cos(x)sin(x)cos(x) 中分解出因数 sin(x)sin(x)
2cos(x)(sin(x)+cos(x))2(sin(x)sin(x)+sin(x)(cos(x)))2cos(x)(sin(x)+cos(x))2(sin(x)sin(x)+sin(x)(cos(x)))
解题步骤 2.10.3
sin(x)sin(x)+sin(x)(cos(x))sin(x)sin(x)+sin(x)(cos(x)) 中分解出因数 sin(x)sin(x)
2cos(x)(sin(x)+cos(x))2(sin(x)(sin(x)+cos(x)))2cos(x)(sin(x)+cos(x))2(sin(x)(sin(x)+cos(x)))
2cos(x)(sin(x)+cos(x))2sin(x)(sin(x)+cos(x))2cos(x)(sin(x)+cos(x))2sin(x)(sin(x)+cos(x))
2cos(x)(sin(x)+cos(x))2sin(x)(sin(x)+cos(x))2cos(x)(sin(x)+cos(x))2sin(x)(sin(x)+cos(x))
解题步骤 3
通过约去公因数来化简表达式。
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解题步骤 3.1
约去 22 的公因数。
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解题步骤 3.1.1
约去公因数。
2cos(x)(sin(x)+cos(x))2sin(x)(sin(x)+cos(x))
解题步骤 3.1.2
重写表达式。
cos(x)(sin(x)+cos(x))sin(x)(sin(x)+cos(x))
cos(x)(sin(x)+cos(x))sin(x)(sin(x)+cos(x))
解题步骤 3.2
约去 sin(x)+cos(x) 的公因数。
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解题步骤 3.2.1
约去公因数。
cos(x)(sin(x)+cos(x))sin(x)(sin(x)+cos(x))
解题步骤 3.2.2
重写表达式。
cos(x)sin(x)
cos(x)sin(x)
cos(x)sin(x)
解题步骤 4
cos(x)sin(x) 转换成 cot(x)
cot(x)
 [x2  12  π  xdx ]