The value of sin 15-cos 15- is equal to

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Properties Derived from Trigonometric Identities

The value of ...

Question

The value of sin 15^o cos 15^o is equal to

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\frac{cos 15^{\circ} + sin 15^{\circ}}{cos 15^{\circ} - sin 15^{\circ}}

The value of cos45°cos15° + sin 45° sin15° is

Δ = ∣ ∣ ∣ \begin{matrix} cos 15^{\circ} & sin 15^{\circ} sin 75^{\circ} & cos 75^{\circ} \end{matrix} ∣ ∣ ∣

Δ = ∣ ∣ ∣ \begin{matrix} cos 15^{\circ} & sin 15^{\circ} sin 75^{\circ} & cos 75^{\circ} \end{matrix} ∣ ∣ ∣

Cos15^o – sin15^o=?

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