1.

Sin 20 + sin 40 - sin 80​

Answer»

welcome to the CONCEPT of trigonometry.

formula used :

sinx-siny= 2cos{(x+y)÷2 }sin {(x-y)÷2)

\sin(<klux>20</klux>)  +  \sin(40)  -  \sin(80)

=2cos 60 sin (-20) + sin20

=sin20[ -2cos60 +1] ( cos60=1/2)

=sin20(0)

=0

i hope it help you



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