2008
Mathematics
POST UTME
The trigonometric expression cos2A + sin 2A can be written as:
A.
cosA(cosA + sinA)
B.
B.cos2A + sin2A – 2sinAcosA,
C.
2sinAcosA + cos2A + sin2A,
D.
D.cos2A +sinA – 2sinAcosA
Correct Answer: 2sinAcosA + cos2A + sin2A,
Explanation
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