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

If p = 8.15, q = 9.06 and r = −17.21, then the value of p³+q³+r³-3pqr

if $${x\over 9}+{8\over x}=1$$, then the value of x³ is :

If  $${{(17)^3-(7)^3}\over (17^2+7^2+k)}=10 $$ , then what is the value of k?

If $${{k^2}\over {k^2-2k+1}}={1\over 6}$$, then what is the value of $${1\over k^3}+k3$$ ?