Option A

<em><u>Solution:</u></em>
Given that we have to rewrite with only sin x and cos x
Given is cos 3x

We know that,

Therefore,
---- eqn 1
We know that,


Substituting these values in eqn 1
-------- eqn 2
We know that,

Applying this in above eqn 2, we get



Therefore,

Option A is correct
The solution is 4x+2x=6x then 6x+10=solution
Answer:
1
Step-by-step explanation:
The discriminant of the quadratic equation 2x2+4x-7=0 is 1
Answer:
The greatest common factor is 2
Step-by-step explanation:
the greatest common factor is 2 because 6 98 and 140 are all numbers that can be multiplied by 2