Question

Find the value of cos70/sin20+cos55 cosec35/tan5 tan25 tan45 tan65 tan85

Answer 1

Cos70/sin20+cos 55.cosec35/tan 5.tan25.tan45.tan65.tan85

=Sin(90-70)/sin20+ sin(90-35). cosec35/tan5.cot(90-85).tan25.cot(90-65).tan45

= Sin 20/sin20+1/tan45

=1+1

=2