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Q. At the foot of the mountain, the elevation of its summit is 45 degree. After going up at a distance of 1km towards the top of the mountain at an angle of 30 degree, the elevation changes to 60 degree. Find the height of the mounatain.
Saturday, August 12, 2017
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Soln: Use formula: cos2A = 2cos^2(A) - 1 cos2A+1= 2cos^2(A) (1+cos2A)/2 = cos^2(A) i.e. cos^2(A) = (1+cos2A)/2
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