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Find the principal value of :
(i)
(ii)
(iii)
(iv) tan-1 (1)
(v)
(vi)
(vii)
NOTE:
Trigonometric Table
(i) Let
⇒ [ We know which value of x when placed in sin gives us this answer ]
∴
(ii) Let
⇒ [We know which value of x when put in this expression will give us this result]
⇒
(iii) Let
⇒ [We know which value of x when put in this expression will give us this result]
∴
(iv) Let
⇒ [We know which value of x when put in this expression will give us this result]
∴
(v) Let
⇒ [We know which value of x when put in this expression will give us this result]
∴
(vi) Let
⇒ [We know which value of x when put in this expression will give us this result]
∴
(vii) Let
⇒
[We know which value of x when put in this expression will give us this result]
∴
Evaluate
Evaluate