i used the double angle identity cos(2x) = cos^2x-sin^2x
Mathematics, 10.12.2019 21:31, gomezjuana123
Evaluate: cos(2arctan(1/3))
i used the double angle identity cos(2x) = cos^2x-sin^2x
cos(2x)= (3/sqrt(10))^2- (1/sqrt(10))^2 = 2/25
2/25 was my answer to this problem but the correct answer was 4/5
how is the correct answer 4/5? ? i thought i did everything right
Answers: 3
Mathematics, 21.06.2019 17:40, zaygonegraduate
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Evaluate: cos(2arctan(1/3))
i used the double angle identity cos(2x) = cos^2x-sin^2x
i used the double angle identity cos(2x) = cos^2x-sin^2x
Mathematics, 30.10.2020 01:00
Mathematics, 30.10.2020 01:00
Mathematics, 30.10.2020 01:00
Mathematics, 30.10.2020 01:00