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Class VI
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Class X
ICSE Grade X - Trigonometrical Identities
Question
1
1.
If
t
=
cos
θ
+
sin
θ
,
u
=
cos
θ
−
sin
θ
then
(
t
2
+
u
2
)
=
1
(
t
2
+
u
2
)
=
2
(
t
2
−
u
2
)
=
2
(
t
2
+
u
2
)
=
0
(
t
2
−
u
2
)
=
1
Question
2
2.
Express
sec
θ
in terms of
cos
θ
√
1
−
cos
2
θ
cos
θ
cos
θ
√
1
−
cos
2
θ
1
√
1
−
cos
2
θ
√
1
−
cos
2
θ
1
cos
θ
Question
3
3.
Which of the following are true?
a)
cos
(
90
+
θ
)
=
−
cos
θ
b)
tan
(
90
+
θ
)
=
−
tan
θ
c)
cos
(
90
+
θ
)
=
−
sin
θ
d)
sin
(
90
+
θ
)
=
−
sin
θ
e)
sin
(
90
+
θ
)
=
cos
θ
f)
tan
(
90
+
θ
)
=
−
cot
θ
{b,c,e}
{d,a,f}
{b,e}
{a,c}
{c,e,f}
Question
4
4.
In
△HIJ
, right angled at
I
,
if
HI = 35 cm
and
IJ = 12 cm
,
find
tan
H
4
11
2
5
12
35
2
7
12
37
Question
5
5.
The value of
cosec
191°
in terms of an angle between
0°
and
90°
is
−
cosec
11°
−
sec
11°
cosec
11°
sec
11°
Question
6
6.
Given that
4
tan
θ
=
3
, find
sin
θ
5
3
5
4
3
5
4
3
4
5
Question
7
7.
Given that
5
cos
θ
=
4
, find
cot
θ
4
3
5
4
3
4
5
3
3
5
Question
8
8.
Given
cosec
E
=
5
4
,
find
cos
E
5
3
3
4
4
3
3
5
4
5
Question
9
9.
sec
12°
cosec
56°
−
cosec
78°
sec
34°
=
-1
0
1
2
sin
12°
2
sin
56°
Question
10
10.
The value of
cosec
54°
in terms of an angle between
0°
and
90°
is
−
sec
54°
sec
54°
−
cosec
54°
cosec
54°
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