calculation of cos 180

Asked by raghavendran7 | 2nd 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

Regards,

Team,

TopperLearning.

Answered by  | 2nd Dec, 2009, 09:44: PM

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