If a=0,sin(x+y)=a11,sin(x−y)=a2,
what is tanytanx?
If cosα=111 and cosβ=1110, the value of sin(α+β)sin(α−β) can be expressed as ba, where a and b are coprime positive integers. What is the value of a+b?
N is an integer in the range [0,180] such that
2cos43∘cos26∘=cos69∘+cosN∘.
What is the value of N?
If a=0,sin(x+y)=a12,sin(x−y)=a5,
what is tanytanx?