Question

- The value of tan 720º - cos 630°-sin 150°cos 120° is
3) 1/2
4) 1
2) 1/3
1) 1/4​

Answer 1

Answer:

Step-by-step explanation:

we can solve each term one by one

first ,tan(720) which is equal to tan0 itself as it comes to 0 after two rotations ,so tan0=0

second,cos(630)=cos(720-90)=cos90=0 itself

i hope u know the identities of all the six trigonometric ratios in the four quadrants

sin(150)=sin(180-30),which is the second quadrant,so sin function is positive there,so it is sin(30)=1/2

cos120=cos(180-60),but cos function is not positive in the second quadrant,

so it is equal to -cos60=-1/2

so soving it ,we get 0-0-(1/2×-1/2)=0-(-1/4)=1/4

so the answer is 1/4

hope this helps you

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