Question

tell me this one☺️☺️☺️☺️

Answer 1

answer is 1 bcoz cos43 is equal to sin 47 so frist two terms become one and sin 18 equals to cos72 so it's value is also1 hence the answer is
1

Answer 2

cos 43 and sin 47 will cancel out similarly sin 18 and cos 72 will b canceled
and
1+ 1 -1
is 1 only
so answer is one