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Grade: 11
        
Sin x +Cos x= 21/2 Sin x.
Then Cos x – Sin x=?
3 years ago

Answers : (2)

noogler
489 Points
							
cosx – sinx = + 21/2cosx
3 years ago
noogler
489 Points
							
let cosx-sinx=k, sinx +cosx= 21/2sinx
square and add both eq.            u get
1+1=2sin2x+k2 …............as sin2x+cos2x=1
solve it …..........
 
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3 years ago
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