cosA=-3/5, pi<=A,=3pi/2 find sin2A
Answers
Answered by
3
Answer:
Given that cosA=-3/5
and
As ,
As x € 3rd quadrant
⟹ only cot and tan will be positive and other trigonometric ratios will be negative hence SinA will be negative.
So,
Now using formula
Answered by
10
Given
where,
•°• A is in Q-lll
To Find:
sin2A
Solution
From Pythagoras theorem
Hypoteneuse² = Adj. side² + Opp. side²
5² = 3² + x²
x² = 5²-3²
x² = 25-9
x = √16
x = 4
Opp. side = 4
Since, A is in Q-lll
["sin " is negative]
w.k.t,
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