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Prove that:
1. 
Ans. L.H.S. = 
= 
= 
= 
= 
= 0 = R.H.S.
2. 
Ans. L.H.S. = 
= 
= 
= 
= 0 = R.H.S.
3. 
Ans. L.H.S. = 
= 
= 
= 
= 
= R.H.S.
4. 
Ans. L.H.S. = 
= 
= 
= 
= 
= R.H.S.
5. 
Ans. L.H.S. = 
= 
= 
= 
= 
= 
= 
= R.H.S.
6. 
Ans. L.H.S. = 
= 
= 
= 
= 
= R.H.S.
7. 
Ans. L.H.S. = 
= 
= 
= 
= 
= 
= 
= 
= R.H.S.
Find 
and 
in each of the following:
8. 
in quadrant II.
Ans. Given: in quadrant II.
= 
= 
[
lies in II quadrant]
Also 
lies in first quadrant.
are positive.
Now, 
9. 
in quadrant III.
Ans. Given: in quadrant III.
Now, 
lies in second quadrant.
are positive and 
are negative.
Now, 
10. 
in quadrant II.
Ans. Given: in quadrant II.
= 
=
[ lies in II quadrant]
Also
lies in first quadrant.
are positive.
Now, 
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