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If cot ( alpha + beta) = 0 then sin ( al...

If `cot ( alpha + beta) = 0` then `sin ( alpha + 2 beta) =`

A

` -sin alpha`

B

`sin alpha`

C

`pm cos beta`

D

both (2) and (3)

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AAKASH SERIES-TRIGONOMERTIC RATIOS-PRACTICE EXERCISE
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  3. If cot ( alpha + beta) = 0 then sin ( alpha + 2 beta) =

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  8. cos5^(@) + cos 24^(@) + cos 175^(@) + cos 204^(@) + cos 300^(@) =

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  9. cos. (pi)/(13) + cos. (5pi)/(13) + cos. (8pi)/(13) + cos. (12pi)/(13)=

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  10. cos. (3pi)/(19) + cos . (7pi)/(19) + cos. (12pi)/(19) + cos. (16pi)/(1...

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  11. tan. (pi)/(10) + tan. (3pi)/(10) + tan. (7pi)/(10) + tan. (9pi)/(10) ...

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  12. If alpha , beta are supplementary angles , then cos^(2)alpha + sin^(...

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  13. If ABCD is a quadrilateral then Sec^(2) ((A+B)/(4))- Cot^(2) ((C+D)/(...

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