Question

If Cos(A-B)/Cos(A-B) + cos(C+D)/Cos(C-D) = 0 then prove that tan A tan B tan C + 1 = 0.
A= Alpha , B = Beta, C = Gama D = Delta

I want step by step explaination I will make u as brainliest please please​

Answer 1

Answer:

The step by step explained answer of the given question is in these two photos!

Also, the required formula of the trigonometry for the above solution is: cos(A-B) =cosAcosB + sinAsinB

and cos(A+B) =cosAcosB - sinAsinB.