CBSE X Maths Some Applications of Trigonometry
angle
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12th February 2009
9:39 PM
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CBSE X Maths Some Applications of Trigonometry
TWO MEN ON EITHER SIDE OF A TEMPLE 75m HIGH OBSERVE THE ANGLES OF ELEVATION OF THE TOP OF THE TEMPLE TO BE 30degree and 60degree RESPECTIVELY. FIND THE DISTANCE BETWEEN TWO MEN.(TAKE ROOT3=1.73)
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27th September 2011
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CBSE X Maths Introduction to Trigonometry
If cos theta - sin theta = root 2 sin theta , then what is the value of cos theta + sin theta ?
- root 2 cos (theta /2)
- (cosec theta) /2
- sin theta
- cos theta
Answer :- cos theta = root2 sin theta + sin theta
=> cos theta = sin theta ( root 2 + 1 )
=> cos theta = sin theta ( root 2 +1) (root 2 -1 ) / (root 2 -1 )
=> cos theta = sin theta [ (root 2)^2 - 1] / root2 -1
=> costheta (root 2 -1) = sin theta (2-1)
=> root 2 costheta - cos theta = sintheta
=> root 2 costheta = sin theta + cos theta -----ans
But there is no option .
- root 2 cos (theta /2)
- (cosec theta) /2
- sin theta
- cos theta
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CBSE X Maths Some Applications of Trigonometry
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CBSE X Maths Some Applications of Trigonometry
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