SIMPLIFY: COS(-a)/sin(90+a)

Asked by swati gaur | 31st May, 2013, 12:57: PM

Expert Answer:

Using identities 
cos(-x) = cosx
sin(90 + A) = cosA
 
COS(-a)/sin(90+a) = cos(a)/cosa = 1

Answered by  | 2nd Jun, 2013, 04:44: PM

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