eramo5720 eramo5720
  • 22-02-2018
  • Mathematics
contestada

Find the exact value of sin ( 2
a. if cos a = 3 /5 . assume a is a quadrant i angle in standard position.

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fawazazeez512p4jykl fawazazeez512p4jykl
  • 22-02-2018
In a right angled triangle 'efg' cos a = 3/5
From Pythagoras theorem the third side will be 4
cos a =3/5
sin a =4/5
sin 2a =2 x 4/5
sin 2a= 8/5
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