3.Trigonometrical Ratios, Functions and Identities
easy

જો $A = 130^\circ $ અને  $x = \sin A + \cos A,$ તો

A

$x > 0$

B

$x < 0$

C

$x = 0$

D

$x \le 0$

Solution

(a) $x = \cos 40^\circ + \cos 130^\circ $

$= 2\cos 85^\circ \cos 45^\circ > 0$.

Standard 11
Mathematics

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