Math, asked by intelligency9670, 1 month ago

tan 9A - tan 5A - tan 4A = tan 9A × tan 5A × tan 4A

Answers

Answered by avabooleav

1

Answer:

Step-by-step explanation:

Tan9A=tan(5A+4A)

Using tan(a+b) formula

Tan 9A = tan5A+tan4A/ 1-tan5atan4a

Tab9A-tan9Atan5Atan4A=tab5a+tan4a

Thus

Tan 9A-tan4A-tan5A= tan9Ax tab5A x tan4A

Hence proved

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