a. For what values of are sin , cos and tan all positive? Give

a. For what values of α are sin α, cos α and tan α all positive? Give your answers in both degrees and radians.

b. Are there any values of α for which sin α, cos α and tan α are all negative? Explain your answer.

c. Are there any values of α for which sin α, cos α and tan α are all equal? Explain your answer.