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Anand
New Member

India
2 Posts

Posted - 08/02/2011 :  02:57:19  Show Profile  Reply with Quote
x= acos+bsin
y= asin-bcos

prove that X+y = a+b
so x+y=
acos+bsin+2acosbsin+asin+bcos-2asinbcos
=a(sin+cos)+b(sin+cos)+2[acosbsin-asinbcos]
=a(1)+b(1)+2 [acosbsin-asinbcos ]

What to do after this step ?
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royhaas
Moderator

USA
3059 Posts

Posted - 08/02/2011 :  07:23:42  Show Profile  Reply with Quote
The term in brackets is zero.
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Anand
New Member

India
2 Posts

Posted - 08/08/2011 :  04:09:59  Show Profile  Reply with Quote
Got it
Thanks
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