Question

( sin 35 / cos 55)^2 + ( cos 35/ein 55)^2 - 2 cos 60

Answer 1

Answer:

sin35/cos55)²+(cos55/sin35)²-2cos60

=[cos(90-35)/cos55]²+[cos55cos(90-35)]²-2cos60

=(cos55/cos 55)²+(cos55/cos 55)²-2cos60

=1+1-2×1\2

=1+1-1

=1