-2sinx.cosx=-sin2x. How?
Answers
Answered by
2
because it is a formula of trigonometry
2sinx.cosx= sin2x
Answered by
3
★Heya★
WE KNOW THAT
Sin ( A + B ) = Sin A × Cos B + Cos A × Sin B
=>
R.H.S
- Sin 2x = - Sin ( x + x )
=>
- Sin ( 2x ) =
- { Sin x × Cos x + Cos x × Sin x }
=>
- Sin ( 2x ) = - 2 Sin x × Cos x
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