Find the value of given expression. 

[76 – {90 ÷ 5 ⨯ (24 – 36 ÷ 3) ÷ 3}] 

$$ if \ {1\over x}+x=4,$$ then find $${1\over x^2}+x^2$$

For what value of m will the system of equations 18x-72y+13=0 and 7x-my-17=0 have no solution?

Find the value of given expression.

3 – (– 6) {– 2 – 9 – 3} ÷ 7{1 + (– 2) (– 1)}

Find the value of given expression.

30 – [40 – {56 – (25 – 13 – 12)}]

Find the value of

 sin⁴30⁰ + cos⁴30⁰ – sin25⁰cos65⁰-sin65⁰cos25⁰

If x = 222, y = 223 and z = 224, then find the value of x³+y³+z³-3xyz

The value of $${1.6×1.6×1.6−1.6×1.6×1.6}\over 1.6×1.6+1.6×1.6+1.6×1.6 $$ is