SOLUTION: Use trigonometrical identities to expand and simplify if possible, the following: 1) cos (270 degrees - theta) 2) sin (270 degrees - theta) 3) cos (270 degrees + theta)

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Question 666132: Use trigonometrical identities to expand and simplify if possible, the following:
1) cos (270 degrees - theta)
2) sin (270 degrees - theta)
3) cos (270 degrees + theta)
Answer by swincher4391(1107) About Me  (Show Source):
You can put this solution on YOUR website!
Remember sin%28A%2BB%29+=+sinA+cosB%2B+cosA+sinB
and cos%28A%2BB%29+=+cosA+cosB+-+sinA+sinB
Let phi+=+270%5Eo
1)
2)
3)