Question

express sin67+cos75 in terms of angle btw 0 and 45

Answer 1

Sin67= Sin(90-23)= cos23

Cos75= cos(90-15)= sin15

so cos23+sin15 is answer

Answer 2

sin67+cos75
cos (90-A) +cos 75
cos(90-65)+cos 75 (because sin A=cos (90-A)
cos 23+sin (90-A)
cos 23+sin (90-75)( because cos A=sin (90-A)
cos23+ sin15