Convert -37⁰30¹ into radian

Find the degree mesures corresponding to  ( -4) ^c. ( use π = ²²/₇)

Express the angular measurement of the angle of a  regular octagon in radians. 

Sin (n + 1 ) x  sin(n+ 2 )x + cos ( n +1 ) x cos ( n + 2 ) x = 

Find the value of sin 75^o

Find the value of sin 765^o

Convert 15⁰ into radian

If sin θ = -⁵/₁₃ and θ lies in third quadrant, find the value of sec θ + tanθ.

If tan θ/2 = t, then (1 - t²)/(1 + t²) is equal to