exam Maths Puzzle Numerical Ability

[t^(2)-3]^(4)-256=0

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exam Other Question

The table shows several value of the function f(x) = -x3 + x2 - x + 2.
Complete the missing values in this table, and then use these
values and the intermediate value theorem to
Evaluate:
secant (pi/4) - sin(13pi/6) -cos(8pi/3)
please help!!!!!