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Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Which sum or difference identity would you use to verify that cos (180° - q) = -cos q? a.) sin (a -b) = sin a cos b – cos a sin b b.) cos (a -b) = cos a cos b – sin a sin b c.) cos (a -b) = cos a cosb + sin a sin b d.) sin (a + b) = sin a cos b + cos a sin b

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?