Question

25
Prove that tan65º = tan25° + 2tan40°

Answer 1

Step-by-step explanation:

Tan65=tan(25+40)

Tan65=(tan25+tan40)/1-tan25.tan40

Tan65(1-tan25.tan40)=tan25+tan40

Tan65-tan65.tan25.tan40=tan25+tan40

Tan65-tan(90–25).tan25.tan40=tan25+tan40

Tan65-cot25.tan25.tan40=tan25+tan40

Tan65-tan40=tan25+tan40

Tan65=tan25+2tan40.

Hence proved.

Mark me as brainliest

Answer 2

Step-by-step explanation:

u tell .... i don't know