If `a cos theta+b sin theta=m` and `a sin theta-b cos theta=n` ,then `a^(2)+b^(2)=`
A)`m+n`,
B) `m^2-n^2`
C)`m^2+n^2`
D)None of these

If acostheta+bsintheta=m and asintheta-bcostheta=n , then a^2+b^2= (a) m^2-n^2 (b) m^2n^2 (c) n^2-m^2 (d) m^2+n^2

If x/a cos theta + y/b sin theta = 1 , x/a sin theta - y/b cos theta = 1 then x^2/a^2 + y^2/b^2 =

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If sintheta +cos theta =m and sec theta + cosec theta =n then n(m+1)(m-1) equals

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If tan theta+sin theta=m and tan theta-sin theta=n , then (a) m^2-n^2=4m n (b) m^2+n^2=4m n (c) m^2-n^2=m^2+n^2 (d) m^2-n^2=4sqrt(m n)

If cos e c\ theta+cottheta=m and cos e c\ theta-cottheta=n , prove that m n=1