if cos 45=1/sqrt2, find cos 315, sin 270, sin 210, tan 210

sibuzwaW 2021-01-25 Answered
if cos45=12, find cos315,sin270,sin210,tan210
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komunidadO
Answered 2021-01-26 Author has 86 answers

cos45=12,sin45=1cos2(45)=112=12=12=cos45,
sin90=sin(245)=2sin45cos45=21212=1,cos90=cos(245)=cos45cos45sin45sin45=1212=0,
sin180=sin(290)=2sin90cos90=0,cos180=cos(290)=cos90cos90sin90sin90=01=1,
cos(X)=cos(X),so cos45=cos(45)=cos(36045)=cos(315)=12.
sin270=sin(180+90)=sin180cos90+cos180sin90=01=1.
sin3X=sin(2X+X)=sin2XcosX+cos2XsinX=2sinXcos2(X)+cos2(X)sin(X)sin3(X),soif3X=90:
1=2sin30(1sin2(30))+(1sin2(30))sin(30)sin3(30

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