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8. Introduction to Trigonometry
easy
લઘુકોણ $A$ અને $B$ માટે, જો $\tan A=1$ અને $\sin B=\frac{1}{\sqrt{2}},$ હોય તો $\cos (A+B)=\ldots \ldots \ldots$
A
$0$
B
$1$
C
$\sqrt{2}$
D
$\frac{1}{\sqrt{2}}$
Solution
$\tan A =1\,\, \therefore A =45$
and $\sin B =\frac{1}{\sqrt{2}} \,\, \therefore B =45$
$\cos ( A + B )=\cos (45+45)=\cos 90=0$
Standard 10
Mathematics