
Learn in your speed, with individual attention - Teachoo Maths 1-on-1 Class
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Question 1 Deleted for CBSE Board 2024 Exams
Question 2 Deleted for CBSE Board 2024 Exams
Question 3 Deleted for CBSE Board 2024 Exams
Question 4 Deleted for CBSE Board 2024 Exams
Question 5 Important Deleted for CBSE Board 2024 Exams
Question 6 Deleted for CBSE Board 2024 Exams
Question 7 Important Deleted for CBSE Board 2024 Exams
Last updated at June 22, 2023 by Teachoo
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°) = 𝒄𝒐𝒔𝟗𝟎° = 0