COS 2a/sin(a- pai/4)=-根号2 /5 1 求 cos a +sin a的值 2 若 - pai
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COS 2a/sin(a- pai/4)=-根号2 /5 1 求 cos a +sin a的值 2 若 - pai
COS 2a/sin(a- pai/4)=-根号2 /5 1 求 cos a +sin a的值 2 若 - pai
COS 2a/sin(a- pai/4)=-根号2 /5 1 求 cos a +sin a的值 2 若 - pai
cos2a/sin(a-π/4)=-√2/5
cos2a*cos(a-π/4)/sin(a-π/4)*cos(a-π/4)
=2cos2a*cos(a-π/4)/sin(2a-π/2)
=-2cos2a*cos(a-π/4)/cos2a
=-2cos(a-π/4)=-√2/5
cos(a-π/4)=√2/10
(1)cosa+sina
=√2cos(a-π/4)
=1/5
(2)sina-cosa
=√2sin(a-π/4)
因为cos(a-π/4)=√2/10
- pai
cos (a+4pai)cos ^2(a+pai)sin^2(a+3pai)/ sin(a-4pai)sin(5pai+a)cos^2(-a-pai)
sin(pai-a)cos(2pai-a)tan(-a+pai)/-tan(-a-pai)sin(-pai-a)
化简:[sin(a+2pai)cos(pai+a)]/[sin(-pai-a)cos(-pai-a)]
化简:sin(2pai-a)cos(pai a)/cos(pai-a)sin(3pai-a)
sin(a-3pai)cos(pai-a) / cos(pai/2 - a)cos(pai+a)sin(pai/2 + a)
sin^2(a+pai)-cos(pai+a)*cos(-a)+1
[tan(pai-a)cos(2pai-a)sin(-a+3pai/2)]/[cos(-a-pai)sin(-pai-a)]=
sin(pai-a)cos(-8pai-a)=60/169且a属于(pai/4,pai/2)求cosa,sina
(sin(a-pai)cot(a-2pai))/(cos(a-pai)tan(a-2pai))
[sin^2(a+pai)cos(pai+a)cos(-a-2pai)]/[tan(pai+a)sin^3(pai/2+a)sin(-a-2pai)]=
sin(a-pai/4)+cos(a-pai/4) 化简~
化简:[cos(a+pai)*sin^2(a+pai)]/[tan^2(pai+a)*cos^3a]
[cos(a-pai/2)]/[sin(5pai/2+a)]*sin(a-2pai)cos(2pai-a)=
化简:sin(2pai+a)tan(pai-a)tan(2pai-a)/cos(-pai-a)tan(3pai+a)
cos^2a-sin^2a/2tan(pai/4-a)coscos^2a-sin^2a/2tan(pai/4-a)cos^2(pai/4-a)=
化简:(2cos^2a-1)/(2tan(pai/4-a)sin^2(pai/4+a))
(2cos^2a-1)/(2tan(pai/4+a)sin^2(pai/4-a))
已知a属于(pai/2,pai),tan(a+pai/4)=1/7,sin a+cos a=?