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Q.

The number of solutions of sin 3x = cos 2x, in the interval (π/2,π) is

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a

2

b

1

c

3

d

4

answer is D.

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Detailed Solution

sin3x=cos2xsin3x=sinπ22x3x=+(1)nπ22x
3x=2+π22x or 3x=(2n+1)ππ22x5x=(4n+1)π2 or x=(4n+1)π2
x=(4n+1)π10 or x=(4n+1)π2 where nZ,xπ2,πx=2π10
The number of solutions : 1.

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The number of solutions of sin 3x = cos 2x, in the interval (π/2,π) is