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Class VI
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Class X
ICSE Grade X - Trigonometrical Identities
Question
1
1.
Express
cos
θ
in terms of
sec
θ
sec
θ
√
sec
2
θ
−
1
√
sec
2
θ
−
1
sec
θ
√
sec
2
θ
−
1
1
√
sec
2
θ
−
1
1
sec
θ
Question
2
2.
The value of
sin
229°
in terms of an angle between
0°
and
90°
is
sin
49°
cos
49°
−
sin
49°
−
cos
49°
Question
3
3.
The value of
sin
94°
in terms of an angle between
0°
and
90°
is
cos
4°
sin
4°
−
sin
4°
−
cos
4°
Question
4
4.
sin
30°
cos
45°
+
cos
30°
sin
45°
=
(
1
4
√
-1
+
1
4
√
6
)
(
1
4
√
4
+
1
4
√
6
)
(
1
4
√
2
+
1
4
4
√
6
)
(
1
4
√
2
+
1
4
√
6
)
(
1
4
√
2
+
3
2
)
Question
5
5.
Express
cot
29°
in terms of
tan
29°
1
√
1
+
tan
2
29°
1
tan
29°
tan
29°
√
1
+
tan
2
29°
√
1
+
tan
2
29°
√
1
+
tan
2
29°
tan
29°
Question
6
6.
Which of the following are true?
a)
cos
(
90
+
θ
)
=
−
cos
θ
b)
sin
(
90
+
θ
)
=
−
sin
θ
c)
sin
(
90
+
θ
)
=
cos
θ
d)
cos
(
90
+
θ
)
=
−
sin
θ
e)
tan
(
90
+
θ
)
=
−
cot
θ
f)
tan
(
90
+
θ
)
=
−
tan
θ
{f,a,e}
{b,d}
{c,d,e}
{a,c}
{b,c,d}
Question
7
7.
Express
sec
38°
in terms of
tan
38°
tan
38°
√
1
+
tan
2
38°
√
1
+
tan
2
38°
√
1
+
tan
2
38°
tan
38°
1
√
1
+
tan
2
38°
1
tan
38°
Question
8
8.
Given
cos
P
=
15
17
,
find
tan
P
17
15
8
17
15
8
8
15
17
8
Question
9
9.
sin
112°
=
sin
64°
cos
48°
+
cos
64°
sin
48°
cos
64°
cos
48°
−
sin
64°
sin
48°
cos
64°
cos
48°
+
sin
64°
sin
48°
sin
64°
cos
48°
−
cos
64°
sin
48°
Question
10
10.
Express
cos
θ
in terms of
cosec
θ
√
cosec
2
θ
−
1
cosec
θ
√
cosec
2
θ
−
1
1
cosec
θ
1
√
cosec
2
θ
−
1
√
cosec
2
θ
−
1
cosec
θ
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