Chloebe5r3tOfe
Chloebe5r3tOfe Chloebe5r3tOfe
  • 14-10-2016
  • Mathematics
contestada

if a and b are the measures of two first quadrant angles and sin a = 4/5 and sin b = 5/13, find sin a+b.

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Hussain514 Hussain514
  • 22-10-2016
given that sin a= 4/5
cos a= √(1-sin²a)
         = √(1-16/25)
         = √(9/25)
         = 3/5
sin b=5/13
cos b= √(1-sin²b)
         = √(1-25/169)
         = √(144/169)
         = 12/13

sin(a+b)= sin a· cos b + cos a · sin b
              = 4/5· 12/13 + 3/5· 5/13
              = 48/65+15/65
               = 63/65
hope it helps

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rrent424
rrent424 rrent424
  • 03-05-2020

Answer:

[A]  sin(a + b) = [tex]\frac{63}{65}[/tex]

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