निम्नलिखित प्रत्येक भाग में sin .(x)/(...

निम्नलिखित प्रत्येक भाग में `sin .(x)/(2) ,cos .(x)/(2)` तथा `tan .(x)/(2)` ज्ञात कीजिएः
`(i) tan x =- (4)/(3) x`, द्वितीय चतुर्थाश में है।
`(ii) cos x=- (1)/(3) ,x-`तृतीय चतुर्थाश में हैं।
`(iii ) sin x = - (1)/(4) ,x -` द्वितीय चतुर्थाश में है।

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