SOLUTION: Find cos (s+t) and cos (s-t)
Cos(s)= 1/5 and sin(t)= 3/5
s and t in Quadrant I
cos(s+t)=?
Simplify your answer, including any radicals. Use integers or fractions for
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-> SOLUTION: Find cos (s+t) and cos (s-t)
Cos(s)= 1/5 and sin(t)= 3/5
s and t in Quadrant I
cos(s+t)=?
Simplify your answer, including any radicals. Use integers or fractions for
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Question 1001389: Find cos (s+t) and cos (s-t)
Cos(s)= 1/5 and sin(t)= 3/5
s and t in Quadrant I
cos(s+t)=?
Simplify your answer, including any radicals. Use integers or fractions for any numbers in the expression. Answer by Cromlix(4381) (Show Source):
You can put this solution on YOUR website! Hi there,
If Cos(s) = 1/5 Sin(s) = root24/5
If Sin(t) = 3/5 Cos(t) = 4/5
Cos(s + t) = coss cost-sins sint
Cos(s + t) = 1/5*4/5 - root24/5*3/5
Cos(s + t) = (4 - 6 root6)/25
........................
Cos(s - t) = coss cost+sins sint
Cos(s - t) = 1/5*4/5 + root24/5*3/5
Cos(s - t) = (4 + 6 root6)/25
...........................
Hope this helps :-)
