1. 1/(1 + cot2 A) + 1/(1 + tan2 A) =   cos2 A   sin2 A   1   sin2 A/cos2 A   0   Hint Half-n-half Clue   2. sin (90o − A) / cos (90o − A) =   cot (90o − A)   tan A   1   cot A   cosec A   Half-n-half Clue   3. The value of sin2 30o + cos2 30o is   1   1 / 4   3 / 2   0   1 / 2   Half-n-half Clue   4. The value of tan 45o − cos 45o sin 45o is   3 / 4   0   1   1 / 4   1 / 2   Half-n-half Clue   5. sin4 A − cos4 A =   sin2 A − cos2 A   tan2 A   0   1   cos2 A − sin2 A   Half-n-half Clue   6. The value of tan 45o + cos 0 + sin 90o is   1 / 2   2   3   0   1   Half-n-half Clue   7. sin2 A − sec2 A + cos2 A + tan2 A =   0   cosec 2A   1   cosec A   cot A   Half-n-half Clue