Find the EXACT value of cos(A−B) if sin A = 12/13, cos A = 5/13, sin B = 3/5, and cos B =
4/5. cos(A−B)=

The value of cos (A - B) is 0.86

Step-by-step explanation:

⇒ cos (A - B) = 5/13 × 4/5 + 12/13 × 3/5

⇒ cos (A - B) = 20/65 + 36/65 = 56/65 = 0.86

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: