exam Maths Puzzle Numerical Ability

does anyone know how to find the exact value of cos 105 degrees without using tables or a calculator. please show work i dont understand how to do this.

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exam Other Question
Hello, I really need some help with this problem 3x - 4y - 12 < 0 Thank you in advance The second hand on a clock is 6 inches long. How far does the tip of the hand move in 40 seconds?