[" 31.The value of "sin20^(@)sin40^(@)si...

[" 31.The value of "sin20^(@)sin40^(@)sin60^(@)sin80^(@)" is "],[" equal to "],[[" (a) "-(3)/(16)," (b) "(5)/(16)," (c) "(3)/(16)," (d) "-(1)/(16)]]

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