Question

answer the question

Answer 1

using formula

sin(A).cos(B)- cos(A). sin(B) = sin (A-B)

sin(2A)= 2 sinA . cosA

proof:

1/sin(10)-√3/cos(10)

4[½cos(10)-√3sin(10)/2 sin(10).cos(10)]

4[sin(30).cos(10)-cos(30).sin(10)/2sin(10).cos(10)]

4[sin(20)/sin(20)]

=4.