Apply CD_conj_add with
Sing 3,
CSNo,
minus_CSNo,
conj_CSNo,
add_CSNo leaving 6 subgoals.
The subproof is completed by applying quaternion_tag_fresh.
The subproof is completed by applying CSNo_minus_CSNo.
The subproof is completed by applying CSNo_conj_CSNo.
The subproof is completed by applying CSNo_add_CSNo.
The subproof is completed by applying minus_add_CSNo.
The subproof is completed by applying conj_add_CSNo.