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

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