book Maths Puzzle Numerical Ability

find the exact value, leaving the answer in a proper form of cos 135 degrees.

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book Other Question

find the value of x in the equation. 2 radical sign x + 20= 15+3 radical sign x The sum of two integers is 39.If 'n' representsthe larger integer,representin terms of 'n':
a.smaller integer
b.six times the smaller integer
c.four times the larger integer