CBSE Class 9 Answered
calculation of cos 180
Asked by raghavendran7 | 02 Dec, 2009, 09:16: PM
Expert Answer
You may use trignometric identities for simplicity,
cos(2x90) = cos290 - sin290 = -1
or
cos(90+90) = cos90cos90 - sin90sin90 = -1
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Team,
TopperLearning.
Answered by | 02 Dec, 2009, 09:44: PM
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