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motaalondrandra motaalondrandra
  • 27-02-2014
  • Mathematics
Answered

write the given expression as the sine of an angle
sin40cos20+cos40sin20

Verified Answer :

Anonymous Anonymous
  • 28-02-2014

It's \(sin(40+20)=sin60=\frac{\sqrt3}2\)

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PSN03
PSN03 PSN03
  • 04-02-2020

Yo sup??

The given expression is in the form

sinAcosB+cosAsinB

we know that

sin(A+B)=sinAcosB+cosAsinB

therefore

sin40cos20+cos40sin20=sin(40+20)

=sin60

=√3/2

Hope this helps.

Answer Link

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