SOLUTION: Please simplify each trigonometric expression: 1. sin(40�) cos (50�)+cos (40�) sin (50�) 2. cos 105� cos 15� � sin 105� sin 15�

Question 454762: Please simplify each trigonometric expression:
1. sin(40�) cos (50�)+cos (40�) sin (50�)
2. cos 105� cos 15� � sin 105� sin 15�
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Please simplify each trigonometric expression:
1. sin(40�) cos (50�)+cos (40�) sin (50�)
---
= sin(40+50)
= sin 90
= 1
====================
2. cos 105� cos 15� � sin 105� sin 15�
= cos(105-15)
= cos(90)
= 0
============
Cheers,
Stan H.

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