3sin72

Asked by vinitha123 | 18th Feb, 2010, 11:08: AM

Expert Answer:

(3sin72)/(7cos18) = (3sin(90-18))/(7cos18) = (3(sin90cos18-cos90sin18))/(7cos18)

= (3cos18)/(7cos18) = 3/7

Regards,

Team,

TopperLearning.

Answered by  | 18th Feb, 2010, 11:15: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.