sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
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sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
sin^6 a+cos^6 a+3×sin^2 a×cos^2 a=?
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+3×sin^2 a×cos^2 a=?
设角a=-35π/6,则2sin(π+α)cos(π-α)-cos(π+α)/ 1+sin^2α+sin(π-α)-cos^2(π+α)sina=sin(-35π/6)=sin(-6π+π/6)=1/2 cosα=根号3/22sin(π+α)cos(π-α)-cos(π+α)/ [1+sin^2α+sin(π-α)-cos^2(π+α)]=2(-sinα)(-cosα)+cosα/[1+sin²
sin的6次方A+cos的6次方A=(sin平方A+cos平方A)(sin的4次方A-sin平方A×cos平方A+cos的4次方A) 怎么算得 (sin平方A+cos平方A) 的平方 -3sin平方A×cos平方A第二个括号可以用平方的平方来开,可开出来就得
[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)
已知(4sin a-2cos a)/(5cos a +3sin a)=6/11,求cos^4 a-sin^4 a
根号3sin(π/6-a)-cos(π/6-a)
化简cos(π/3+a)+sin(π/6+a)
化简:cos(π/3+a)+sin(π/6)+a=
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)是如何计算出的
1-cos^6(a)-sin^6(a)化简得3sin^(a)cos^(a)的详细过程!
cos派/6+Tan派/4-sin派/3= cos(3派+a)=
2(sin^6 α +cos^6α)-3(sin^4a+cos^4α)mingbaidian
2(sin^6 α +cos^6α)-3(sin^4a+cos^4α)
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
(1-sin^6a-cos^6a)/(1-sin^4a-cos^4a)=?
(1-sin^4a-cos^4a)/(1-sin^6a-cos^6a)