Evaluate cos15 sin15sin75 cos75

(cos 15)(cos 75) (sin 15)(sin 75) = nbsp;(cos 15)(sin 15) nbsp;(sin 15)(cos 15) = 0 ...

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Circular Measurement of Angle

Evaluate cos1...

Question

Evaluate $∣ ∣ ∣ \begin{matrix} c o s 15 & s i n 15 s i n 75 & c o s 75 \end{matrix} ∣ ∣ ∣$

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