Question

If cos a -
11
and tan
find sin(a + 8)
2
3
where a and both are acute angles.​

Answer 1

Answer:

If cos a -

11

and tan

find sin(a + 8)

2

3

where a and both are acute angles.

Answer 2

In triangle ABC, ∠A + ∠B + ∠C =180 °

∠A + ∠C= 180°- 90°= 90°⇒None of the angles can be ≥ 90° ∴ The other 2 angles must be acute angles.