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" (ii) "cos theta=(x^(2)+1)/(x)...

" (ii) "cos theta=(x^(2)+1)/(x)

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If cos theta=(1)/(2)(x+(1)/(x)) then (1)/(2)(x^(2)+(1)/(x^(2)))=

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If 2 cos theta = x + (1)/(x), prove that 2 cos 3 theta = x ^(3) + (1)/(x ^(3)).

i) Prove that: (1-sin2A)/(1+sin2A) = tan^(2)(pi/4-A) ii) If costheta=1/2(x+1/x) , then prove that: cos2theta=1/2(x^(2)+1/x^(2)) and cos3theta=1/2(x^(3)+1/x^(3))

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cos^(-1)(x//a)+cos^(-1)(y//b)=theta ,then (x^(2))/(a^(2))-(2xy)/(ab)cos theta+(y^(2))/(b^(2))=