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13. If cos , then find the value of 2 sec-9 + 2 tane-7.2θ - |
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Answer» Let ABC be a right angle triangle , right angled at B and C= theta Therefore cos theta = 2/3 ( given) And cos theta = BC/AC So, BC=2 , AC = 3 So using Pythagoras theorem .AB = √5Now 2 sec squared theta + 2 tan squared theta -7= 2*9/4+2*5/4-7= 14/2-7= 7-7=0 |
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