Question

(iv) sin 35° sin 55° - cos 35º cos 55° = 0​

Answer 1

Answer:

Step-by-step explanation:

sin35 sin55 - cos35 cos55

= -[cos35cos55- sin35sin55]

= - cos(35+55)

= -cos90

=-0

=0   !

Answer 2

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sin 35° sin 55° - cos 35º cos 55° = 0

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Since Cos (a + b) = - ( sin a × Sin b - cos a × cos b)

So cos (35+ 55) = -(sin35 sin 55 - cos 35 cos 55)

So = - cos 90 = 0

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