The value of (20/cos70) to one decimal place is 58.5
Trigonometric functions are functions that relate the sides of a right triangle and it's acute angle. Some of the functions are tan, cos sine e.t.c
The other functions are;
cot = 1/tan
sec = 1/cos
cosec = 1/sin
Except for the special angles that we can know their exact values other angles can be found by calculator or tables.
The value of cos 70 = 0.342
20/cos70 = 20/0.342
= 58.5( 1dp)
Therefore the value of 20/(cos70) to 1dp is 58.5