Question

sin 720º-cot 270º - sin 150° cos 120° = ?​

Answer 1

Answer:

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Step-by-step explanation:

Tan 720 = Tan(360 + 360)

= Tan 360

= 0.

cos 270 = cos(180 + 90)

= -cos90

= 0.

sin150 = sin(90 + 60)

= cos 60

= 1/2.

cos 120 = cos(180 - 60)

= -cos 60

= -1/2.

Now,

Tan 720 - cos 270 - sin 150 * cos 120

= 0 - 0 -( \frac{1}{2} ) (- \frac{1}{2})=0−0−(

2

1

)(−

2

1

)

= 0 + 0 + \frac{1}{4}=0+0+

4

1

\frac{1}{4}

4

1

Hope this helps