1.

Atowersubtendsan anglealphaat apointAin the planeof itsbaseand the angleof depressionof thefootof thetowerata pointb fthustaboveA isbeta. Thenthe heightof thetower is

Answer»

B TAN `alphacotbeta `
`bcotalphatan BETA `
`b cotalphacot beta `
`b tanalphatan beta `

ANSWER :A


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