What is the simplified value of (sin^3 2...

What is the simplified value of `(sin^3 21^@+ cos^3 19^@)/(sin 21^@+ cos 19^@)+sin^2 69^@+ cos^2 71^@+1/(sec69^@ cosec71^@)` is :
`(sin^3 21^@+ cos^3 19^@)/(sin 21^@+ cos 19^@)+sin^2 69^@+ cos^2 71^@+1/(sec69^@ cosec71^@)` का सरलीकृत मान क्या हैः

A

3

B

1

C

4

D

2

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