Which trigonometric ratio will not have the same value as sin a?
a) cos a
b) sin c
c) tan c
d) cos c

M (<C) = 45
m (<B) = 90
In a triangle the sum of angles = 180;
m (<A) = 180 - 90 - 45 = 45

sin A = sin 45 = 
sin 45= cos 45 = 

cos A = cos 45 = sin A
sin C = sin 45 = sin A
cos C = cos 45 = sin A

But tan C = tan 45 = 1
It means that the answer to you question is C) tan C