Question

(a)Prove that



!"# + !"#

= 2 sec (5)

(b)Prove that

!"# &

&

=

&

'"# & (5)

(c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =​

Answer 1

(a)Prove that

!"# + !"#

= 2 sec (5)

(b)Prove that

!"# &

&

=

&

'"# & (5)

(c)Prove that sin 780 . sin 480 + cos 120 . sin 30 =

Answer 2

Answer:

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