SOLUTION: Suppose sin x= 2/7, sin y= -1/5, cos x= 3 √5/7, cos y= -2 √6/ 5 Find sin(x+y), cos(x+y), tan(x+y)

Question 1198298: Suppose sin x= 2/7, sin y= -1/5, cos x= 3 √5/7, cos y= -2 √6/ 5
Find sin(x+y), cos(x+y), tan(x+y)
Found 2 solutions by Alan3354, MathLover1:
Answer by Alan3354(69443) (Show Source): You can put this solution on YOUR website!
Suppose sin x= 2/7, sin y= -1/5, cos x= 3 √5/7, cos y= -2 √6/ 5
Find sin(x+y), cos(x+y), tan(x+y)
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Look up "Half-angle formulas" on Wikipedia
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

given:

Find

approximately:

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