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kekich228
@kekich228
July 2022
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sin(67)*sin(53)-cos(67)*sin(37)
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sedinalana
Verified answer
Sin53=sin(90-37)=cos37
sin67*cos37-cos67*sin37=sin(67-37)=sin30=1/2
5 votes
Thanks 4
ник3709
Sin67°sin53°-cos67°sin37°=
sin67°sin53°-cos67°sin(90°-53°)=
sin67°sin53°-cos67°cos53°=
-(cos(67°+53°))=-cos120°=
1/2.
0 votes
Thanks 1
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Answers & Comments
Verified answer
Sin53=sin(90-37)=cos37sin67*cos37-cos67*sin37=sin(67-37)=sin30=1/2
sin67°sin53°-cos67°sin(90°-53°)=
sin67°sin53°-cos67°cos53°=
-(cos(67°+53°))=-cos120°=
1/2.