Respuesta :

lulubell17

Answer:I think it is 12/25

Step-by-step explanation:

From the sum of angle A and angle B equal to 90°, we can say that;

cos B = 3/5

  • We are given that;

∠A + ∠B = 90°

cos A = 4/5

sin A = 3/5

  • According to trigonometric ratios of a right angled triangle, we know that;

sin = opposite/hypotenuse

cos = adjacent/hypotenuse

  • Now, we are given; cos A = 4/5 and sin A = 3/5

This means;

hypotenuse = 5

Opposite of angle A = 3

Adjacent side of angle = 4

  • Now, if the other angle in the triangle is B, it means;

Opposite of angle B = 4

Adjacent side of angle = 3

Thus, cos B = adj/hyp = 3/5

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