[" 1915"],[" 19"],[" (1) "cos38^(@)cos52...

[" 1915"],[" 19"],[" (1) "cos38^(@)cos52^(@)-sin38^(@)sin52^(@)=0]

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

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

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

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

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

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

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

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

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

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

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