Find the exact value of the expression. Do not use a calculator. 1 - cos2 69° - cos221°
1 - cos2 69° - cos221° = _______
(Simplify your answer, including any radicals. Use integers or fractions for any numbers in
Homework Answers
SOLUTION :
1 - cos^2 (69) - cos^2 (21)
= sin^2 (69) - cos^2 (90-69)
= sin^2 (69) - sin^2 (69)
= 0 (ANSWER).
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