tan(A+B) tan(A-B)= sin²A- sin²B/ cos²A- sin²B
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Answer:
it's prooved
Step-by-step explanation:
tan(A+B)* tan(A-B)= tan^2A -tan^2 B
tanA = sinA / cosA
so ,
sin^2A - sin^B / cos^2A - cos^2 B
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