EXERCISE 4 (b 2. tan 0 + co
1+cos
Prove that
1. sec 0 cot 0 = cosec
cos
3.
= 1+ sin .
seco-tán
3-4 sine
5.
3- tan²o.
cos²e
4.
sin 0(1+
6. (tanA + c
cot A
cot A
7. cos A=
(A € III or IV quad.
cosecA
+ cot? A
9. sec? A + cosec? A=sec? A cosec? A. 10. sin +
11. sino (1 + coto) = 1.
12. (tan A+
V(1
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