1. Calculate tan(-15):
we will use tan( -) = (tan -tab)/(1+tan *tan )
so, tan (45-60) = (tan 45 -tan 60) /(1+ tan45 *tan 60)
= (1 -√3 )/1+1*√3
rationalize = (1-√3)/(1+√3 )* (1+√3/1+√3)
= -2 +√3
1.6m questions
2.0m answers