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6. The principal value of tan-1 1 is given by
A. π/2
B. π/3
C. π/6
D. π/4
8. The cosine function can be restricted to any interval of the type_______, for its inverse to exist
A. [nπ/2,(n+1) π/2]
B. (nπ,(n+1) π)
C. [nπ ,(n+1) π]
D. (nπ/2,(n+1) π/2)
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