NCERT Class XI Mathematics - Trigonometric Functions - Solutions
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Question : 9
Total: 61
sin x =
, x lies in second quadrant.
Solution:
sin x =
⇒ cosec x =
c o s 2 x = 1 - s i n 2 x ⇒ c o s 2 x = 1 -
=
⇒ cos x = ±
∴ cos x = -
[since x lies in second quadrant] ⇒ sec x = −
∴ tan x =
= −
⇒ cot x = −
∴ cos x = -
∴ tan x =
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