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CBSE Class 10 Answered

whyyyyyyyyyyyyyyyyyyyyy
Asked by | 11 Dec, 2009, 06:47: PM
answered-by-expert Expert Answer

Sin 2A = sin (A+A)= sin Acos A+sin Acos A  =2 sin Acos A(using sin (x+y) =sin x cos y +siny cos A

Answered by | 12 Dec, 2009, 05:54: PM

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CBSE 10 - Maths
Two pillars are standing on either side of a 80 m wide road. Height of one pillar is 20 m more than the height of the other pillar. From a point on the road between the pillars, the angle of elevation of the higher pillar is 60°, whereas that of the other pillar is 30°. Find the position of the point between the pillars and the height of each pillar. (Use √3 = 1-73)
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CBSE 10 - Maths
Two buildings face each other. The height of one building is greater than that of the other. The smaller building is 80 m high. The angles of depression of the top and the bottom of the smaller building from the top of the taller building are 45º and 60º respectively. Find the height of the taller building.
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
a person standing on the bank of a river observes that the angle subtented by a tree on the opposite bank of 60 degree. when he retreates 20m from the bank he find the angle to be 30 degree . find the height of the tree and the bradth of the river
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CBSE 10 - Maths
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CBSE 10 - Maths
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CBSE 10 - Maths
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