化简sin^6 a+cos^6 a+3sin^2 acos^2a注意是6次方不是6倍a 三角函数一看就烦 请达人指导
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化简sin^6 a+cos^6 a+3sin^2 acos^2a注意是6次方不是6倍a 三角函数一看就烦 请达人指导
化简sin^6 a+cos^6 a+3sin^2 acos^2a
注意是6次方不是6倍a
三角函数一看就烦 请达人指导
化简sin^6 a+cos^6 a+3sin^2 acos^2a注意是6次方不是6倍a 三角函数一看就烦 请达人指导
sin^6 a+cos^6 a+3sin^2 acos^2a
=(sin^2 a+cos^2 a)(sin^4 a+cos^4 a-sin^2 acos^2 a)
+3sin^2 acos^2a
=sin^4 a+cos^4 a-sin^2 acos^2 a+3sin^2 acos^2a
=sin^4 a+cos^4 a+2sin^2 acos^2 a
=(sin^2 a+cos^2 a)^2
=1
=sin^6 a+cos^6 a+3sin^2 acos^2a(sin^2a+cos^2a)
=(sin^2a+cos^2a)^3
=1^3
=1
化简cos(π/3+a)+sin(π/6+a)
化简:cos(π/3+a)+sin(π/6)+a=
化简1-sin^4a-cos^4a/1-sin^6a-cos^6a
1-sin^6a-cos^6a分之1-sin^4a-cos^4a 化简
sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
化简(1-sin^6 a-cos^6 a)/(cos^2 a-cos^4 a)==
化简:(sin^6a+cos^6a-1) / (sin^4ª+cos^4a-1)
[Sin(6π+a)Cos(7π-a)]/[Sin(3π+a)+Sin(-π+a)
由cos(a+b)=cos a cos b-sin a sin b cos(a-b)=cos a cos b+sin a sin b解题设a为锐角,证:1、2分之根3乘cos a + 2分之1乘sin a=cos(6分之π-a)2、cos a-sin a=根号2cos(4分之π+a)
化简sin^6a+cos^6+3sin^2acos^2a的结果是?
化简1-cos^4a-sin^4a/1-cos^6-sin^6acos^6应为cos^6a
已知(4sin a-2cos a)/(5cos a +3sin a)=6/11,求cos^4 a-sin^4 a
化简:tan(2π-a)sin(-2π-a)cos(6π-a)/cos(a-π)sin(5π-a)
根号3sin(π/6-a)-cos(π/6-a)
化简sin a+cos a
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?
化简[1-cos^4(A)-sin^4(A)]/[1-cos^6(A)-sin^6(A)] 等于多少?急用!