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[tex] \frac{cos4^{\circ}-cos6^{\circ}-cos8^{\circ}+cos10^{\circ}}{sin^{2}1^{\circ}cos1^{\circ}cos7^{\circ} } [/tex]
[tex] \frac{cos4^{\circ}-cos6^{\circ}-cos8^{\circ}+cos10^{\circ}}{sin^{2}1^{\circ}cos1^{\circ}cos7^{\circ} } [/tex]
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