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# a projectile is launched at angle x from a cliff of height H above sea level. it falls in to the sea at a distance of D from the base of the cliff.

a projectile is launched at angle x from a cliff of height H above sea level. it falls in to the sea at a distance of D from the base of the cliff. show that the maximum height above sea level is H+D2tan2x/4(H+Dtanx