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29-05-2020
Mathematics

contestada

If cos A = 12/13 , and ∠A is in the fourth quadrant, find the exact value of sin2A.

Respuesta :

facundo3141592 facundo3141592

03-06-2020

Answer: 0.71

Step-by-step explanation:

we have that cos(A) = 12/13

then:

A = Acos(12/13) = 22.62°

But A is in the fourth quadrant, so A is actually 22.62° + 180° = 202.62°

Then Sin(2A) = sin(2*202.62°) = 0.71

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