Question :  The value of $1 \frac{3}{4}+1 \frac{5}{7} \div 2 \frac{3}{7} \times 2 \frac{3}{7}=$?

Option 1: $1 \frac{11}{28}$

Option 2: $2 \frac{13}{28}$

Option 3: $3 \frac{13}{28}$

Option 4: $4 \frac{23}{28}$

Question : If $2x-\frac{1}{2x}=5,x\neq0$, then the value of $(x^2+\frac{1}{16x^2}-2)$is:

Option 1: $\frac{19}{4}$

Option 2: $\frac{23}{4}$

Option 3: $\frac{27}{4}$

Option 4: $\frac{31}{4}$

Question : If $a=26$ and $b=22$, then the value of $\frac{a^3-b^3}{a^2-b^2}-\frac{3 a b}{a+b}$ is_______.

Option 1: $\frac{5}{3}$

Option 2: $\frac{13}{11}$

Option 3: $\frac{1}{3}$

Option 4: $\frac{11}{13}$

Question : If $a^2+1=9a$ and $a\neq0$, then the value of $a^2+\frac{1}{a^2}$ is:

Option 1: 81

Option 2: 18

Option 3: 79

Option 4: 83

Question : If $\sin A = \frac{4}{5}$, then what is the value of $\sin^2 A$?

Option 1: $\frac{26}{25}$

Option 2: $\frac{36}{25}$

Option 3: $\frac{48}{25}$

Option 4: $\frac{16}{25}$