Question

COS
+ sin 660° + tan 411
6
+ cot 315​

Answer 1

Answer:

Step-by-step explanation:

We can write the given expression as,

`(-sin(2pi-60^@)tan(3pi-30^@)sec(pi+60^@))/(cos(pi+45^@)cosec(pi-45^@)cos(3pi-30^@)`

`=(sin60^@(-tan30^@)(-sec60^@))/((-cos45^@)(cosec45^@)(-cos30^@))`

`=(sqrt3/2(-1/sqrt3)(-2))/((-1/sqrt2)(sqrt2)(-sqrt3/2))`

`=1/(sqrt3/2) = 2/sqrt3.`