Question : Simplify the following expression:
$\frac{\left(a^2+b^2-c^2\right)^2-\left(a^2-b^2+c^2\right)^2}{b^2-c^2}$

Option 1: $3a^2$

Option 2: $4a^2$

Option 3: $5a^2$

Option 4: $2a^2$

Question : Simplify the given expression $\frac{3\left(\sin ^4 z-\cos ^4 z+1\right)}{\sin ^2 z}$

Option 1: 9

Option 2: 2

Option 3: 4

Option 4: 6

Question : Simplify the expression:
$\frac{a+b}{a-b} \div \frac{(a+b)^2}{\left(a^2-b^2\right)}$

Option 1: $–1$

Option 2: $(a + b)$

Option 3: $0$

Option 4: $1$

Question : Simplify the given expression $\frac{4\left[(17)^3-(7)^3\right]}{(17)^2+(7)^2+119}$

Option 1: 40

Option 2: 50

Option 3: 60

Option 4: 30

Question : Simplify the given expression.
$40 \times 7-2 \times\left(11^3 \div 11\right) \div 22+30$

Option 1: 297

Option 2: 298

Option 3: 300

Option 4: 299