Yajing L. answered • 04/07/14
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Ph.D student from Colorado State University
cos2θ=1, so 2θ=2kπ(k∈Z), then θ=kπ(k∈Z).
Chloe S.
asked • 04/07/14Solving trig identities
No restrictions on Θ.
cos2Θ-1=0
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2 Answers By Expert Tutors
Kostyantyn M. answered • 04/07/14
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Master of Mathematics
cos(2*theta) = 1
2*theta = 2*n*pi (n is any integer)
theta = n*pi
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