exam Maths Puzzle Numerical Ability

My homework tells me to prove an identity, sin(x-3 times pie divided by 2)=cosx

I cant figure it out please help

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Problem#1

how can i actually prove it if this is the equation to use.

the problem states:

Prove that if a line has slope ma nd y-intercept b, then an equation of th e
In your day to day life think about relationships between varibles.

1. Choose a relationship between two varibles that you think is linear.

Pick 5 or 6 real life data point