Kenneth S. answered • 03/29/16
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The given cosecant value means, equivalently, that sin θ = -2/3. Then cos (2θ) = 1-2sin2(θ) =
1-(-2/3)2 = 1 - 4/9 = 5/9.
Kenneth S.
Hatha has caught a mistake that I made in the last line of solution offered in March, namely I lost the coefficient 'two' when substituting. Good work, Hatha.
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05/10/18
Hatha S.
05/09/18