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Values of theta satisfying the eqation s...

Values of `theta` satisfying the eqation `sintheta+sin7theta=sin4theta` for `theta in (0, pi/2)` are

A

(a) `(pi)/(9),(pi)/(4)`

B

(b) `(pi)/(3),(pi)/(9)`

C

(c) `(pi)/(6),(pi)/(9)`

D

(d) `(pi)/(3),(pi)/(4)`

Text Solution

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The correct Answer is:
A
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