" (ii) "cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0

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

Find the value of: (i)tan90^@ (ii) cos38^@cos52^@-sin38^@sin52^@

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

Show that : (i) tan\ 48^@ tan 23^@\ tan 42^@tan 67^@=1 (ii) cos 38^@\ cos 52^@ - sin 38^@ sin 52^@=0

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

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

Show that : cos 38^@ cos 52^@-sin 38^@ sin 52^@ = 0

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

Show that : cos 38 ^@ cos 52 ^@ - sin 38^@ sin 52 ^@ = 0

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