Trigonometry without calculator

One instrument that can be used is Trigonometry without calculator.

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How to evaluate trigonometric functions without a calculator?

Trigonometry solutions without calculator. cos x = 5 + 1 4 where x is in radians results in one solution of x = π 5, how do I prove this without the use of a calculator. similarly if
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Trigonometry without a Calculator

Question 1: Find tan 135° without using a calculator. Solution: tan 135° = tan (90° + 45°) = tan ( (1 × 90°) + 45°) = -cot 45° = -1. Explanation As here too, an odd coefficient of 90° is

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