Differential Calculus and Trigonometry (Revision and problems)

[mezoelprince]

المشاركة الأصلية كتبت بواسطة Unique Muslimah

i was asking about how you do the problem without a calculator!! thanks!l

mmmmmm
i know
but i was talkin about something else.......
about using it without calculator....
there 's a method an easy one .....