Trigonometry - Mathematics Questions and Answers

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(Q1) Mathematics » Trigonometry

If sin (A/2) = x, then the value of x is

A

√[(1+cos cos A)/2]

B

√[(1-cos cosA)/2] 

C

√[(1-sin sinA)/2] 

D

√[(1+sin sinA)/2] 

(Q2) Mathematics » Trigonometry

The value of sin23°cos67°+sec52°sin38°+cos23°sin67°+cosec52°cos38°cosec220°-tan270° is :

A

4

B

3

C

2

D

0

(Q3) Mathematics » Trigonometry

If 4sin2θ=3(1+cosθ),0°<θ<90° , then what is the value of (2tanθ+4sinθ-secθ) ?

A

415-3

B

153+3

C

153-4

D

315-4

(Q4) Mathematics » Trigonometry

The angle of elevation of the top of an unfinished tower at a point distant 78 m from its base is 30°. How much higher must the tower be raised (in m) so that the angle of elevation of the top of the finished tower at the same point will be 60°?

A

26√ 3

B

52√ 3

C

80

D

78√ 3