1.

To the height of a hill CD with its top as C, a horizontal line AB of length a is drawn along the foot of the hill. If angleCAB = alpha, angleCBA = beta, angleDAC = gamma, then CD is :

Answer»

`(a SIN BETA sin GAMMA)/(sin(ALPHA + beta))`
`(a sin beta sin gamma)/(sin(alpha - beta))`
`(sin(alpha - beta))/(a sin beta sin gamma)`
`(sin(alpha + beta))/(a sin beta sin gamma)`

ANSWER :A


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