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genadijfilatov
@genadijfilatov
August 2021
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cos 150o cos 210o - sin 150o sin 210o - cos2 15o + sin2 15o
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kirichekov
Verified answer
Cos150*cos210-sim150sin210-cos215+sin215=cos(150+210)-cos(180+45)+sin(180+45)=cos360+cos45-sin45
1+√2/2-√2/2=1
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Verified answer
Cos150*cos210-sim150sin210-cos215+sin215=cos(150+210)-cos(180+45)+sin(180+45)=cos360+cos45-sin451+√2/2-√2/2=1