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Trigonometry

Name

E-mail

1

3/2

2

1/4

-1/32

1/512

1/1024

-1/2048

0

26

28

36

m+n / m-n

m-n / m+n

m+n / mn

m-n /mn

Two vertical poles 20m and 80 m stands apart on a horizontal plane . The height of the point of the intersection of the lines joining the top of each pole to the foot of the other is

15 m

16 m

18 m

50 m

If the angles of the elevation of the top of a tower from three collinear points A,B and C on a line leading to the foot of the tower are 30 degree , 45 degree, 60 degree respectively , the the ratio AB: BC is

A bird is sitting on the top of a vertical pole 20m high and its elevation from a point O on the ground is 45 degree It flies off horizontally straight away from the point O , after 1s , the elevation of the bird from O is reduced to 30 degree . Then the speed (in m/s) of the bird is

A tree stands vertically on a hill side which makes an angle of 15 degree with the horizontal . From a point on the ground 35m down the hill from the base of the tree , the angle of elevation of the top of the tree is 60 degree . the height of the tree is

sinAcosA + 1

secA cosecA + 1

tanA + cotA

secA + cosecA

1 - a^2 -b^2

1 - 2a^2 - 2b^2

2 + a^2 -b^2

2 - a^2 -b^2

1

1/2

2

4

m

n

2m

2n

2secθ

-2secθ

2cosecθ

None of these

If sinθ + sin2θ + sin3θ = sinα And cosθ + cos2θ +cos3θ=cosα , then θ is equal to

α/2

α

2α

α/6