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1. Find the solution of 2sin-x + sin-2x-2

Answer»

2sin^2x+ (2sinx.cosx)^2=2

2sin^2x+4sin^2x.cos^2x=2

sin^2x+2sin^2x.cos^2x=1

2sin^2x.cos^2x= 1-sin^2x

2sin^2x.cos^2x= cos^2x

2sin^2x=1

sin^2x= 1/2

sinx= 1/√2

=> x= pi/4 or 45 degrees

Since the value of sinx repeats after every 180 deg turn, so....you would get the same value of sinx if you add pi to pi/4 or 2pi to pi/4. The solutions are countless.

x= pi/4, 3pi/4 etc



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