(a)Prove that !"# + !"# = 2 sec (5) (b)Prove that !"# & &= &'"# & (5) (c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =

(a)Prove that !"# + !"# = 2 sec (5) (b)Prove that !"# & &= &'"# &

1.	(a)Prove that !"# + !"# = 2 sec (5) (b)Prove that !"# & &= &'"# & (5) (c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =
Answer» E that !"# + !"# = 2 sec (5) (B)PROVE that !"# &&= &'"# & (5) (c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =

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(a)Prove that !"# + !"# = 2 sec (5) (b)Prove that !"# & &= &'"# & (5) (c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =​

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(a)Prove that !"# + !"# = 2 sec (5) (b)Prove that !"# & &= &'"# & (5) (c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =