What are the exact solutions of sin2x+sinx-2cox-1=0?

sin2x+sinx-2cox-1=0

As we know, Sin 2x =2sinx cosx

2Sinx Cosx+Sinx-2cosx-1=0

Sinx(2cos x+1)-1(2cosx+1)=0

(sinx-1)(2cosx+1)=0

So, either sinx-1=0 or 2cos x+1=0

Sin x=1 or cos x=

x= or multiples of

x= or multiples of

x= or multiples of

4/6 = 2/3

so it should take 3/3 hours per man. so 9 hours is the answer 3*3 =9

step-by-step explanation:

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