If sin =1/2then show that 3cos -4cos^3=0

Step-by-step explanation:

sen(x)=0.5

3cos(x)-4cos^3(x)=0

Remember:

cos^3(x)=cos(x)*cos^2(x)

3cos(x)-4(cos(x)*cos^2(x))=0

we have :

cos^2(x)=1-sin^2(x)

Then:

3cos(x)-4(cos(x)*(1-sin^2(x)))=0

sin^2(x)=(0.5)^2=0.25

3cos(x)-4(cos(x)*(1-0.25))=0

3cos(x)-4(cos(x)*(0.75))=0

Finally

3cos(x)-3cos(x)=0

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answer: the two figures are congruent.

step-by-step explanation: they're congruent because figure efgh is reflected across the x and y axis but it was also rotated.

hope it !