![trigonometry - Easy way of memorizing values of sine, cosine, and tangent - Mathematics Stack Exchange trigonometry - Easy way of memorizing values of sine, cosine, and tangent - Mathematics Stack Exchange](https://i.stack.imgur.com/OBSn1.gif)
trigonometry - Easy way of memorizing values of sine, cosine, and tangent - Mathematics Stack Exchange
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
![Find the exact value of the following expression without using a calculator: cos \left ( \dfrac{5 \pi}{3} \right ). | Homework.Study.com Find the exact value of the following expression without using a calculator: cos \left ( \dfrac{5 \pi}{3} \right ). | Homework.Study.com](https://homework.study.com/cimages/multimages/16/study_unit_circle_026183497276432875781.png)