Let
S = [ t a n A / ( 1 − c o t A ) ] + [ c o t A / ( 1 − t a n A ) ] R = s e c A c s c A
Find S-R
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A more simpler solution will be to substitute the value of tan θ = s i n θ / c o s θ in the very beginning itself ,I stress you to do so .Because to find relation between S &R we need one in terms of other.It will be wise to exploit R which is much simpler in form than S .So,we need to write S in terms of R.Now R is already in terms of s i n θ & c o s θ i.e in simplest form,therefore I recommend to solve it by substituting tan θ = s i n θ / c o s θ in the very beginning itself i.e. the first step of the solution .
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Let t a n A = T then
S = T 2 / [ T − 1 ] − 1 / [ T ( T − 1 ) ] = ( T 2 − T + 1 ) / T
Substituting T = t a n A = s i n A / c o s A
we get S = R − 1