Question Number 103983 by I want to learn more last updated on 18/Jul/20

If  α  and  β  are two unequal angle, which satisfy the equation,      a cos(α)  +  b sin(β)  =  c,    show that  (i)    sin(((α  + β)/2)) sec(((α  −  β)/2))  =  (b/c)  (ii)     tan((α/2)) tan((β/2))  =  ((c  −  a)/(c  +  a))