Show that 
Solving LHS, ![]()
Let ![]()
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And, ![]()
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----(i)
Again, let ![]()
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-----(ii)
We know that, ![]()
[from(i), (ii)]
![]()
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= RHS
Since, LHS=RHS
Hence Proved.
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![in[ - 3 pi /4 , pi /4 ]](https://static.philoid.co/ncertusercontent/solutions/?domain=gF&l=PROJ28887/1554363434711417.png)


