Q1. The value of sin55^° - sin19^°+ sin53^° - sin17^° is always equal to Q2. Tan9^° - tan27^° - tan63^° +tan81^°=

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tan 9^{\circ} \times tan 27^{\circ} \times tan 63^{\circ} \times tan 81^{\circ}

tan 9^{\circ} - tan 27^{\circ} - tan 63^{\circ} + tan 81^{\circ} .

t a n 9 - t a n 27 - t a n 63 + t a n 81 =

tan $9^{\circ}$ - tan $27^{\circ}$ - tan $63^{\circ}$ + tan $81^{\circ}$ =

tan 9^{\circ} \cdot tan 27^{\circ} \cdot tan 45^{\circ} \cdot tan 63^{\circ} \cdot tan 81^{\circ}

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