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[" (1) "tan48^(@)cos52^(@)-sin38^(@)sin5...

[" (1) "tan48^(@)cos52^(@)-sin38^(@)sin52^(@)=0],[" (i) "cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0]

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Show that : cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Prove that : (i) sin42^(@)cos48^(@)+sin48^(@)cos42^(@)=1 (ii) cos70^(@)cos20^(@)-sin70^(@)sin20^(@)=0

Show that : cos38^@cos52^@-sin38^@sin52^@=0 .

The value of cos38^(@)cos52^(@)-sin38^(@)sin52^(@) is :

sin38^(@)+sin22^(@)=sin82^(@)

Show that(ii) Cos38^@Cos52^@-Sin38^@Sin52^@=0

(2sin38^(@))/(cos52^(@))

cos52^(@)+cos68^(@)+cos172^(@)=?

(sin52^(@)+cos38^(@))/(sin38^(@)+cos52^(@))