Rewrite with only sin x and cos x.
cos 3x

a. cos x - 4 cos x sin2x
b. -sin3x + 2 sin x cos x
c. -sin2x + 2 sin x cos x
d. 2 sin2x cos x - 2 sin x cos x

Option A

Solution:

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

differnt varibles efect the range

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

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