What is the value of cos 250-cos 350 -

The correct option is B 2sin 50 ...

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General Solution of tan theta = tan alpha

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Question

What is the value of cos 25⁰- cos35⁰?

-2sin5⁰

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2sin 5⁰

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{cos}^{2} 10^{\circ} - cos 10^{\circ} cos 50^{\circ} + {cos}^{2} 50^{\circ}

{cos}^{2} 10^{\circ} - cos 10^{\circ} cos 50^{\circ} + {cos}^{2} 50^{\circ} =

{cos}^{2} 5^{0} + {cos}^{2} 10^{0} + {cos}^{2} 15^{0} + \dots . + {cos}^{2} 360^{0}

{cos}^{2} 5^{0} + {cos}^{2} 10^{0} + {cos}^{2} 15^{0} + {cos}^{2} 20^{0} + {cos}^{2} 70^{0} + {cos}^{2} 75^{0} + {cos}^{2} 80^{0} + {cos}^{2} 85^{0}

cos 25^{0} + sin 25^{0} = k,

cos 50^{0}

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