Question

Prove that
Tan 11A.Tan7A.Tan4A=tan 11a-tan 7a-tan 4a

Answer 1

hey there here is the answer

question ' Prove that

Tan 11A.Tan7A.Tan4A=tan 11a-tan 7a-tan 4a

answer 11A =7A +4A

tan 11A = tan(7A+4A)

tan11A = tan7A+tan4A÷1-tan7A×tan4A. {using formula tan(A+B).

tan11A(1-tan7A×tan4A) = tan7A+tan4A

tan11A-tan11A×tan7A×tan4A = tan7A+tan4A

tan11A-tan7A-tan4A = tan11A×tan7A×tan4A

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