三角函数题化简1、cos(a-π\2)\sin(a+5π\2) *sin(a-2π)*cos(2π-a)2、sin(a+2\π)*cos(a-3π\2)*tan(π\2-a)
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![三角函数题化简1、cos(a-π\2)\sin(a+5π\2) *sin(a-2π)*cos(2π-a)2、sin(a+2\π)*cos(a-3π\2)*tan(π\2-a)](/uploads/image/z/4019341-13-1.jpg?t=%E4%B8%89%E8%A7%92%E5%87%BD%E6%95%B0%E9%A2%98%E5%8C%96%E7%AE%801%E3%80%81cos%28a-%CF%80%5C2%29%5Csin%28a%2B5%CF%80%5C2%29+%2Asin%28a-2%CF%80%29%2Acos%282%CF%80-a%292%E3%80%81sin%28a%2B2%5C%CF%80%29%2Acos%28a-3%CF%80%5C2%29%2Atan%28%CF%80%5C2-a%29)
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三角函数题化简1、cos(a-π\2)\sin(a+5π\2) *sin(a-2π)*cos(2π-a)2、sin(a+2\π)*cos(a-3π\2)*tan(π\2-a)
三角函数题化简
1、cos(a-π\2)\sin(a+5π\2) *sin(a-2π)*cos(2π-a)
2、sin(a+2\π)*cos(a-3π\2)*tan(π\2-a)
三角函数题化简1、cos(a-π\2)\sin(a+5π\2) *sin(a-2π)*cos(2π-a)2、sin(a+2\π)*cos(a-3π\2)*tan(π\2-a)
1.cos(a-π/2)/sin(a+5π/2)*sin(a-2π)*cos(2π-a)
=cos(a-π/2)/sin(a+π/2)*sin(a)*cos(-a)
=-sin a/cos a*sin a*cos a
=-(sina)2
1、原式=cos(π/2-a)*sina*cos(-a)/sin(a+π/2)
=sina*sina*cosa/sin(π/2-a)
=sina*sina*cosa/cosa
=sin²a
2、原式=sin(π/2-a)*cos(π+π/2-a)/tana
=-cosacos(π/2-a)*cosa/sina
=-sinacosa*cosa/sina
=-cos²a
只会第一题/第二题不知道什么意思