Plan: 1. We know that cot(A)=1tan(A) and tan(A)=1cot(A). We can use these identities to simplify the given equation. 2. After simplifying, we should be able to prove the given identity.
Let's carry out the plan:
Step 1: Substitute cot(A)=1tan(A) and tan(A)=1cot(A) in the given equation:
1tan(A)+tan(B)1tan(B)+tan(A)=cot(A)tan(B)
Step 2: Simplify the equation:
1+tan(A)tan(B)1+tan(A)tan(B)=cot(A)tan(B)
Step 3: The left side of the equation simplifies to 1:
1=cot(A)tan(B)
Step 4: Substitute cot(A)=1tan(A) in the equation:
1=1tan(A)tan(B)
Step 5: Simplify the equation:
1=tan(B)tan(A)
Step 6: Multiply both sides by tan(A):
tan(A)=tan(B)
So, we have proved the given identity.
\tan(A)=\tan(B)