29.Sin2 (51-x) +sin (39 + x) =

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{sin}^{2} (51^{o} - x) + {sin}^{2} (39^{o} + x)

cosec 39^{\circ} = x

\frac{1}{{cosec}^{2} 51^{\circ}} + {sin}^{2} 39 + {tan}^{2} 51^{\circ} - \frac{1}{{sin}^{2} 51 + {sec}^{2} 39^{\circ}}

Simplify: $39 x - [23 x - {29 x - (17 x - 3 x)}]$

sin 39^{\circ} - cos 51^{\circ}

t a n x = \frac{2 b}{a - c} (a \neq c), y = a c o s^{2} x + 2 b s i n x c o s x + c s i n^{2} x a n d z = a s i n^{2} x - 2 b s i n x c o s x + c o s^{2} x,

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