Question: Simplify the expression by using an appropriate identity Do not use a calculator cos21 cos69 sin21 sin69 cos21 cos69 sin21 sin69 1

Simplify the expression by using an appropriate identity Do not use
a calculator cos21 cos69 sin21 sin69 cos21 cos69 sin21 sin69 1

Simplify the expression by using an appropriate identity Do not use a calculator cos21 cos69 sin21 sin69 cos21 cos69 sin21 sin69 1

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