Without using trigonometric tables, find the value of the following ex

How to Find Exact Values of Tangent & Cotangent Using the Unit Circle & Special Triangles, Algebra

How can someone find the values of the following, in a simplified surd form without using tables or calculators: sin 135, cos 210 and tan 240? - Quora

Trigonometric ratios in right triangles (article)

16. Without using trigonometric tables, the value of the following expression: sec (90°- 0) cosec 0 -tan (90° -) coto + cos2 25° + cosa 65° 3 tan 27° tan 639

Finding cos Value from Trigonometric Table

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Chapter 05.01: Prerequisites to Interpolation

How to do a trigonometry question or find trig values without a calculator - Quora

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Section 4.3: Right Triangle Trigonometry