book Maths Puzzle Numerical Ability

find the exact value of cos 105 degrees WITHOUT USING TABLES OR A CALCULATOR. be sure to show your work.

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book Other Question

What are the length and width of a rectangle if the area is 13.5 square feet and the length of one side is .2 the measure of the perimeter? I didnt know which topic to put this under but i need it simplified please.
The numbers on the left and right of the multiplication sign are ment to be fractions where the / sign