1.

Assertion (A) : "sin" (pi)/(n)+"sin" (3pi)/(n)+"sin"(5pi)/(n)+....+ to n terms=0 Reason (R): sin alpha+ sin (alpha+ beta)+...+ to n terms =(Sin ((n beta)/(2)))/(Sin beta//2)xxsin ((2 alpha+(n-1)beta)/(2))

Answer»

A is TRUE R, is true ` R rArr A`
A is true R is true but `R cancel rArr A`
A is true, R is FALSE
A is false, R is true

Answer :A


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