Question

find the value of sin(1485°)​

Answer 1

Answer:

(a) sin (-1485°)

= - sin (1485)

(sin (-x) = -sin x)

= - sin (4.360°+45°)

= - sin (45°)

{sin (2nπ+a) = sin a}

= - 12√ . Ans.

(b) cos (390°) = cos (360°+30°)

= cos 30°

{cos (2nπ+a) = cos a}

= 3√2 . Ans.

(c) tan (330°) = tan (360°-30°)

= tan (-30°)

{tan (2π-a) = tan (-a) }

= - tan 30°

{tan (-a) = - tan a}

= - 13√ . Ans.

Answer 2

Answer:

= -12√12. Ans

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