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MAST10005 Calculus 1

Assignment 1 Written Part

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1. Define sets P, C S R2  by:

C = {(x, y) e R2  I x2 + 4y6  = 4y4 }

P = {(2 cos(t) sin2 (t), sin(t)) I t e R}.

Note that P is expressed using abbreviated” descriptive notation.

Prove that P S C . Reviewing Question 5 of Workshop 2 should get you started.

2.   (a) Use a sign diagram to express

A = {x e R / {-1, 0, 1} > 0}

as a union of intervals.

g

(b) By solving the inequality sin(2x) > cos(x), express B =,x e ( , ) I sin(2x) > cos(x) 、

as an interval. Some hints:

● Review Question 5(c) of Practice Class 1.

● Add the values of cos() and sin() to the unit circle diagram at right.

1

θ =

− 1                                                                        1

− 1