Hello Priya
It is explained here https://www.teachoo.com/5225/955/What-is-value-of-sin--cos--tan-at-0--30--45--60---90-degree----Chapter/category/Trignometric-ratios-of-Specific-Angles---Evaluating/
Written on Oct. 27, 2018, 1:29 p.m.
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How to learn trignometery table
Davneet Singh
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