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Using the cosine difference formula, what is the value of
cos15∘? \cos 15 ^ \circ ?cos15∘?
Which of the following is equal to
cos56∘cos11∘+sin56∘sin11∘? \cos 56 ^ \circ \cos 11 ^ \circ + \sin 56 ^ \circ \sin 11 ^ \circ ? cos56∘cos11∘+sin56∘sin11∘?
cos15∘cos45∘−sin15∘sin45∘? \cos 15 ^ \circ \cos 45 ^ \circ - \sin 15 ^ \circ \sin 45 ^ \circ ?cos15∘cos45∘−sin15∘sin45∘?
Which of the following is NOT equal to cos2θ \cos 2 \theta cos2θ?
NNN and MMM are real numbers such that
cos(α+β)=Ncosαcosβ+Msinαsinβ \cos ( \alpha + \beta) = N \cos \alpha \cos \beta + M \sin \alpha \sin \beta cos(α+β)=Ncosαcosβ+Msinαsinβ
is an algebraic identity. What is the value of N+MN+MN+M.
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