If P+Q+ R = 180°, then prove that:
cos (Q+R-P) + cos (R+P-Q) + cos (P+Q-R)
= sinʼP + 4cos P. cos Q. cos R+ cos² P
Answers
Answered by
0
Answer:
hope it help you
Step-by-step explanation:
plese follow
Attachments:
Similar questions