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4)	The+angle+of+elevation+of+a+tower+from+a+point+on+the+same+level+as+the+foot+of+the+tower+is+30%C2%B0.+On+advancing+150+meters+towards+the+foot+of+the+tower%2C+the+angle+of+elevation+of+the+tower+becomes+60%C2%B0.+Show+that+the+height+of+the+tower+
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