输入问题...
三角学 示例
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
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
从 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
将 00 和 2sin(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
从 2sin(x)cos(x)+2cos2(x)2sin(x)cos(x)+2cos2(x) 中分解出因数 2cos(x)2cos(x)。
解题步骤 1.5.1
从 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
从 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
从 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
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
将 22 乘以 -1−1。
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
将 -1−1 乘以 -1−1。
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
将 11 和 11 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
从 2+2sin(x)cos(x)-2cos2(x)2+2sin(x)cos(x)−2cos2(x) 中分解出因数 22。
解题步骤 2.7.1
从 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
从 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
从 -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
从 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
从 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(1−cos2(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
从 sin2(x)+sin(x)cos(x)sin2(x)+sin(x)cos(x) 中分解出因数 sin(x)sin(x)。
解题步骤 2.10.1
从 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
从 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
从 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
解题步骤 3.1
约去 22 的公因数。
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。
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
将 cos(x)sin(x) 转换成 cot(x)。
cot(x)