Adart hits the circular dartboard shown below at a random point. find the probability that the dart lands in the shaded circular region. the radius of the dartboard is 10in , and the radius of the shaded region is 4in .

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