Find sin(theta) where theta is angle made by direct tangents of two Circles & their radii are 4 & 1

Two circles of radii 4 cm and 1cm touches each other externally and theta is angle contained by their direct common tangents then value of sin( theta) is ?
Parallel lines making same angle with common lines
Radius perpendicular on tangents
Circles touches Externally i.e. R1+R2=C1C2
Line passing through C1 and C2 bisect angle between direct common tangents of both circles
Pythagoras theorem
Trigonometric ratios
Half angle formula

[@IshantThawari]

Sir me class 11th cha student aahi kahi 11 che chapter gehu shata ka

[@maheshlilhare898]

Topics?
But I have bz schedule...I'll post video by my availability of time

[@IshantThawari]

Sir binomial theorem

[@maheshlilhare898]

Ok sir ​@@IshantThawari