Question

Please help me to solve this problem

Answer 1

Answer:

cos 23° + sin 15°

Step-by-step explanation:

Need to know (or work out again from a graph):

• sin x = cos (90° - x)
• cos x = sin (90° - x)

So...

sin 67° + cos 75°

= cos (90° - 67°)  +  sin (90° - 75°)

= cos 23° + sin 15°