Question

Write the value of sin (45 + theta) – cos (45 – theta)

Answer 1

sin (45 + theta) - Cos (45 - theta)

=sin(45 + O) – cos(45 – O)

=sin(45 + O) – sin{90- (45 – O)}   (since, cosO =sin (90 – O))

= sin(45 + O) – sin{45 + O}

=0