Proove that: tanα + cotα = secα. cosecα

see explanation

Step-by-step explanation:

Using the trigonometric identities

tan a = , cot a =

sec a = , cosec a =

Consider the left side

tana + cota

= +

=

=

= ×

= seca . coseca

= right side , thus proven

- 1.613 = -1.6 or -1.61

-1.522 = -1.5 or -1.52

0.587 = 0.6 or 0.59

3.079 = 3.1 or 3.08

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: