If csc theta = -2.06, find sec(theta-pi/2)

Find the exact value
sin pi/ 18cos pi/9 + cos pi/18sin pi/ 9

Please help me soon, i dont need an explanation but it would be very helpful or if you know a website that can help me i will be very appreciative!

a) sec (θ -π/2) =  co secθ

b)

Step-by-step explanation:

a)

Given co sec θ = -2.06

sec (θ -π/2) = sec(π/2 -θ) = co secθ

b)

we will use formula

sin A cos B + Cos A sin B = sin(A+B)

Given

                                                =  

                                                =

                                                =

                                               =  

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values