How do you convert persentiges into decimals?

Percent means "per 100", so 50% means 50 per 100, or simply 50/100

If you divide 50 by 100 you get 0.5 (a decimal number).

So, to convert from percent to decimal: divide by 100, and remove the "%" sign.

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step-by-step explanation:

sin(7pi/6 - pi/3)  

= sin(7pi/6 - 2pi/6)  

= sin(5pi/6)  

= sin(pi - pi/6)  

= sin(pi/6)  

= 1/2  

sin 7pi/6 - sin pi/3  

= sin (pi + pi/6) - sin pi/3  

= -sin pi/6 - sin pi/3  

= -1/2 - sqrt(3)/2  

= -(1+sqrt(3))2