Math, asked by hiralpathak3889, 11 months ago

Sin(-330).cos(-300)+sin(-420).cos390 =-1/2

Answers

Answered by GoKuL3112003

0

Sin(-x)=Sin(360-x),Sin(90-x)=Cos(x) so
Sin(-330)=1/2;Cos(-300)=1/2;Sin(-420)=-Sin60;Cos390=Cos30=Sin60
So
1/2×1/2-3/4=-1/2

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