Question

find the value of sinx and cosx at the value of x=-120°​

Answer 1

Answer:

1. sinx

putting x = - 120°

then

sun(-120°) = - sin120° = -√3/2

2.. cosx

= cos( -120°) = cos120° = -½

Step-by-step explanation:

formula used :

sin(-∅) = -sin∅

and cos(-∅) = cos∅

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Answer 2

Step-by-step explanation:

sin x for x = - 120°

sin(-120)° = - sin (90+ 30)°. (sin(-x) = - sin x and cos(-x) = cosx )

= - cos 30°. ( sin(90 + x) = cosx and cos(90 + x) = - sin x )

= - √3/2.

and cos x for x = - 120°

cos( - 120)° = cos (90 + 30)°

= - sin 30°

= -1/2

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