exam Maths Puzzle Numerical Ability

Please help me finde the value of cos^-1(0)
Thank you, Natalie

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exam Other Question

Find the exact value of:
4csc(3pi/4)-cot(-pi/4) A rectangular sheet of cardboard has a square of the same size cut fro each of its corners. then the sides are folded upward to make a topless box. the width of the uncut cardboard