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Q25 of 27 Page 1

If tanA = 3/4, find the value of 1/sinA + 1/cosA

OR


If √3 sinƟ-cosƟ=0 and 0°<Ɵ <90°, find the value of Ɵ


tanA = 3/4 = 3k/4k


sinA = 3k/5k = 3/5, cosA = 4k/5k =4/5 (By Pythagoras theorem)


To find: 1/sinA + 1/cosA


= 5/3 + 5/4


= (20 + 15)/12


= 35/12


OR


√3 sinƟ = cosƟ


sinƟ/cosƟ = 1/√3


tanƟ = 1/√3


Ɵ = 30°


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22

Find the point on x-axis which is equidistant from the points (2,-2) and (-4,2).

OR


P (-2, 5) and Q (3, 2) are two points. Find the co-ordinates of the point R on PQ such that PR=2QR.


24

Draw a line segment PQ of length 9cm. With P and Q as centres, draw circles of radius 5cm and 3cm respectively. Construct tangents to each circle from the centre of the other circle.

27

Prove that 2-√3 is irrational, given that √3 is irrational.

28

If one root of the quadratic equation 3x2 + px + 4 = 0 is 2/3, then find the value of p and the other root of the equation.

OR


The roots α and β of the quadratic equation x2 - 5x + 3(k - 1) = 0 are such that α – β = 1. Find the value of k.


Questions · 27
Set-I
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