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The value of the expression cosec 20o – sec 20o is equal to
2
2 sin 20o/sin 40o
4
4 sin 20o/sin 40o
sec2 (= is true if and only if
x+ y (0
x=y, x(0
x=y
x(0, y(0
The number of real solutions of tan-1 is
zero
one
two
inifinite
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30o
45o
60o
75o
If sin ?=a and sec ?+ cosec ?=b, then the value of b(a2-1) is equal to:
2a
3a
0
2ab
For an acute angle ?, sin ? + cos ? takes the greater value when ? is:
30o
45o
60o
90o
From the top of the building 60 m, high, the angles of depression of the top and bottom of a tower are observed to be 30o and 60o. find the height of the tower?
35 m
40 m
45 m
30 m