Sin 75 0 Sin 450 Cos 360 Sin 450 30 Sin 45 053 20 Sin 459 Cos 30 Os 145 Sin 30 S

Find the exact value of the following:
a) 

These are my attempts. Please show all work.

Attachment 1
Attachment 2

sin? ( 75 0)Sin (450 ) cos* (360)sin? (450 + 30")Sin ( 45" ) (053/ 20)[ sin (459) cos ( 30") + (os 145" ) sin(30.Sin( 45 " ) cos ? ( 309)VZV32(E)7(272Z2174-72324-/2234 V2627/2
 
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