Question

find sin2a if, cos a= 5/13​

Answer 1

Step-by-step explanation:

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Answer 2

Answer:

120 / 169

Step-by-step explanation:

cos a= 5/13 = base / hypotenuse

to find perpendicular using Pythagoras theorem

P = $\sqrt{13^{2}-5^{2} }$ = 12

now, sin a = perpendicular / hypotenuse = 12 / 13

sin2a = 2 sina cosa = 2 x (12/13) x (5/13) = 120 / 169