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Example 9 Find the value of cos (–1710°). cos⁡(−1710°) = 𝒄𝒐𝒔⁡(𝟏𝟕𝟏𝟎°) = cos⁡(1710 ×𝜋/180) = 𝒄𝒐𝒔⁡(𝟏𝟗𝝅/𝟐) = cos⁡(𝟗 𝟏/𝟐 𝝅 ) = cos⁡(𝟏𝟎𝝅−𝝅/𝟐) = 𝒄𝒐𝒔⁡((−𝝅)/𝟐) = cos⁡((−180)/2) = cos⁡(–90°) = 𝒄𝒐𝒔⁡𝟗𝟎° = 0

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Davneet Singh

Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.