Sin240. Cos690+cos780. Sin1050
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ans=-1
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Hi friend!!
Sin(240)=sin(180+60)=-sin60=-√3/2
Cos(690)=cos(720-30)=cos30=√3/2
Cos(780)=cos(720+60)=cos60=1/2
Sin(1080)=sin(3×360)=0
Now, Sin240. Cos690+cos780. Sin1050
=(-√3/2)(√3/2)+(1/2)(0)
=-3/4
I hope this will help you ;)
Sin(240)=sin(180+60)=-sin60=-√3/2
Cos(690)=cos(720-30)=cos30=√3/2
Cos(780)=cos(720+60)=cos60=1/2
Sin(1080)=sin(3×360)=0
Now, Sin240. Cos690+cos780. Sin1050
=(-√3/2)(√3/2)+(1/2)(0)
=-3/4
I hope this will help you ;)
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