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Grade: 12
        
sinx *siny=1\4
3tanx=4tany
prove that
sin(x+y)=7\16
one year ago

Answers : (2)

Arun
22751 Points
							
Dear manish
 
your question is wrong. Please check and repost it or you can also attach an image.
I think it hsould be sin x cos y = 1/4
 
regards
Arun (askIITians forum expert)
one year ago
rajeswari
19 Points
							
given that 3/4=tanx/tany
3/4=(sinx*cosy)/(cosx.siny)
(cosx*siny)*3/4=sinx*cosy
sin(x+y)=sinxcosy+cosxsiny
sin(x+y)=sinxcosy(1+3/4)
sin(x+y)=(1/4)*(7/4)
sin(x+y)=7/16
 
one year ago
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