Simplify the following equation
$$ {\sqrt{(1-sin^{2}θ) ÷{(1-cos^{2}θ)}}}$$

Simplify : $$ {(7) ^{2} ÷(7^{1\over 2})^{4}}$$

Solve: 12–[26–{2+5×(6–3)}]

25.6% of 250 +√ ? = 119

Direction: what should come in place at question mark(?).

$$ {\sqrt{4489}+(71)^{2}-(?)^{2}=2707}$$

Direction : What should come in place of the question (?) in the following question.

$$ {\sqrt{441}}+ {(71)^{2}} -{(?)^{2}}=2707 $$

If $$ {(x-2)^{2}+(y-{1\over2})^{2}}=0$$, then the value of $$ {x\over y}$$ is

Find the value of $$ (2 {1\over6}+1 {13\over18}-{1\over6}) × {16÷4}$$