SOLUTION: Given: 0� < x < 90� and sin(x) = 3/5. Find the exact value of cos(x + 180�).

Question 746152: Given: 0� < x < 90� and sin(x) = 3/5.
Find the exact value of cos(x + 180�).
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
If we don't remember how phase shifts work we can always use the sum/difference identities:

now
cos(180)=-1 and sin(180)=0

and in our case

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