vec_sin_cos_derivs
vec_sin_cos_derivs(a, b, order=1, up_vectors=None, check_derivatives=False, zero_thresh=None):
Derivative of sin(a, b) and cos(a, b) with respect to both vector components
a:np.ndarrayvector other vector
order:intnumber of derivatives to return
zero_thresh:None | floatthreshold for when a norm should be called 0. for numerical reasons
:returns:listd e r i v a t i v e
t e n s o r s