(ii) Prove that cot A + tan (7 + A) + tan (+ + ) + tan (27 – A) = 0
Prove that cot A + ta
an
+Al+ tan I
Answers
Answered by
0
Answer:
4 cm
Step-by-step explanation:
Explanation:
x
=
tan
81
+
tan
9
−
(
tan
63
+
tan
27
)
=
cot
9
+
tan
9
−
(
cot
27
+
tan
27
)
=
(
cos
9
)
2
+
(
sin
9
)
2
sin
9
⋅
cos
9
−
(
cos
27
)
2
+
(
sin
27
)
2
sin
27
⋅
cos
27
=
1
sin
9
⋅
cos
9
−
1
sin
27
⋅
cos
27
=
2
sin
18
−
2
sin
54
=
2
⋅
sin
54
−
sin
18
sin
54
⋅
sin
18
=
4
cos
36
⋅
sin
18
cos
36
⋅
sin
18
=
4
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