Prove the following:Cos 
cos 
- sinSin = sin(x+y)
Prove the following:Cos cos - sinSin = sin(x+y)
cos - sinSin = sin(x+y)
This is of the form CosACosB-SinASinB = Cos(A+B)∴ L H S = Cos
= Cos
= Sin(x+y)
Hence proved.
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+2cos2 
+2sec2 
= 10
= cot2x
cos(2
+x) 
= 1