SOLUTION: Use a double-angle identity to find the exact value of the expression: {{{1 - 2sin^2(75)}}}

SOLUTION: Use a double-angle identity to find the exact value of the expression: {{{1 - 2sin^2(75)}}}

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Question 1115146: Use a double-angle identity to find the exact value of the expression:

Answer by ikleyn(52847) (Show Source): You can put this solution on YOUR website!
.

 = cos(2*75�) = cos(150�) = .

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