22-02-2019
Mathematics

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what is the value of cos15

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janak1610 janak1610

22-02-2019

the value of cos 15 is √3+1/2√2

explanation

cos (45-30)

=cos45*cos30+sin45*sin30

=1/√2 * √3/2 + 1/√2 * 1/2

=√6/4 + √2/4

=√6 + √2/4

=√3+1/2√2

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