sinA =3/5, A in first quadrant
, sin2A=_____
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Answered by
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sin 2a = 2*sin a* cos a. => 2* 3/5* 4/5. => 24/25 or -24/25 base on the angle a [ The value of sin 2a can be 24/25 or -24/25 based on which quadrant a is in ]
Answered by
1
Step-by-step explanation:
sin2A=2.sinA.cosA
here sinA=3/5
so,
opp. side of angle A is 3k units
hyp. side of angle A is 5k units
by pythogoras thm adj side to angle A is 4k units
(√(5k)^2-(3k)^2= 4k)
so cosA=4k/5k=4/5
Therefore
sin2A=2.3/5.4/5
sin2A=24/25
hope this helps u!
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