Question

ir sin A=cos A,0 smaller than A smaller than 90°,then the angle A is equal to
(A)30°
(B)60°
(C) 0°
(D)45°​

Answer 1

Answer:

Well, it's pretty simple... From 0° to 90° the values of sin and cos are equivalent only at one place and that is 45°

sin45°=cos45°=1/√2

Answer 2

Answer:

45°

Step-by-step explanation:

Given

$\sin(a) = \cos(a) \\ \\ \sin(a) = \sin(90 - a) \\ \\ on \: equating \: lhs \: and \: rhs \: we \: get \\ \\ a = 90 - a \\ \\ 2a = 90 \\ \\ a = 45$