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3.Trigonometrical Ratios, Functions and Identities
easy
જો $\sin \theta + \cos \theta = 1$, તો $\sin \theta \cos \theta = $
A
$0$
B
$1$
C
$2$
D
$0.5$
Solution
(a) $\sin \theta + \cos \theta = 1$
Squaring on both sides, we get
$ \Rightarrow {\sin ^2}\theta + {\cos ^2}\theta + 2\sin \theta \cos \theta = 1$
$\therefore \sin \theta \cos \theta = 0$.
Standard 11
Mathematics
