In a class of 30 students, 20 students like Math and 15 like Science. Also, each student likes at least one of the two

subjects. Find how many students like both the subjects. Also,

illustrate the above information in a Venn-diagram.​

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