7cos2(4x) + 7 sin2(4x)
Factor out the 7:
7*(sin2(4x) + cos2(4x))
Since sin2(θ) + cos2(θ) = 1 (let θ = 4x)
7*(1) = 7
Sarah J.
asked • 08/27/147cos^2 (4X) + 7sin^2 (4x)
solve with only trig identities, no calc
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3 Answers By Expert Tutors
Francisco E. answered • 08/27/14
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Francisco; Civil Engineering, Math., Science, Spanish, Computers.
7cos^2 (4X) + 7sin^2 (4x)
we can factorize and we have:
7(cos^2 (4X) + sin^2 (4x))
But sin2(4x) + cos2(4x) = 1 no matter which angle is (4x)
Then the answer is 7
Phillip R. answered • 08/27/14
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Top Notch Math and Science Tutoring from Brown Univ Grad
factor out the 7
7 (cos2(4x) + sin2(4x)) cos2(Y) + sin2(Y) = 1
7(1) = 7
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