if cos(x-y) =-1,show that sinx+siny=cosx+cosy=0
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Hi Mate!!
Cos ( x - y ) = Cos ( π )
x - y = π
x = π + y
Sin ( x ) + Sin ( y ) = Sin ( π + y ) + Sin ( y )
=>. -Sin ( y ) + Sin ( y ) = 0
Cos ( x ) + Cos ( y ) = Cos ( π + y ) + Cos ( y )
=>. - Cos ( y ) + Cos ( y ) = 0
......................................................................
=>. Sin ( x ) + Sin ( y ) = Cos ( x ) + Cos ( y ) = 0
=>. Have a nice time. .<=
Cos ( x - y ) = Cos ( π )
x - y = π
x = π + y
Sin ( x ) + Sin ( y ) = Sin ( π + y ) + Sin ( y )
=>. -Sin ( y ) + Sin ( y ) = 0
Cos ( x ) + Cos ( y ) = Cos ( π + y ) + Cos ( y )
=>. - Cos ( y ) + Cos ( y ) = 0
......................................................................
=>. Sin ( x ) + Sin ( y ) = Cos ( x ) + Cos ( y ) = 0
=>. Have a nice time. .<=
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0
hope it helps you!
Thank you!
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