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Diana18111
@Diana18111
August 2022
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cos180 - 2tg (-45) + 4sin 390
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Lesben
Cos 180° -2.tg (-45°) + 4.sin 390°=
= -1 -2.(-1) +4.sin(360°+30°)=-1+2+4.sin30°=1+4.1/2=
=1+2=3
cos 180°=-1
tg(-45°)=-tg45°=-1
sin 390°=sin 30°=1/2
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Answers & Comments
= -1 -2.(-1) +4.sin(360°+30°)=-1+2+4.sin30°=1+4.1/2=
=1+2=3
cos 180°=-1
tg(-45°)=-tg45°=-1
sin 390°=sin 30°=1/2