Please explain the solution. (l —sin A)(l + sin A)
cos A
cos A
2 -1 = RHS
cos A
cot A — cos A cosec A — I
Example 14 : Prove that
cot A + cos A ¯ cosec A + I
cos A
Solution : LHS —
cot A — cos A
— cos A
cot A + cos A =
+ cos A
sin A
Sin2
cos2 A
Example 15 :
1
cos A
-1
sin A
1
cos A
sin A
sin 0 —cos 0 + I
Prove that
sin 0 +
1
-1
sin A
1
sin A
1
= RHS
cosec A + I
