book Maths Puzzle Numerical Ability

Express the same function of a positive acute angle of sin -315 degrees not using a calculator.

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book Other Question

The difference between two numbers is 4. Twice the larger number is 11 more than 3 times the smaller number. Find the numbers. The question is 4x^2 - 20 = 5. I know that I have done these recently but I am drawing a blank.