Question

in triangle or if r= 90° sin Q=1/2 then 3 cos q - 4 cos cube Q is equal is

Answer 1

The answer is 0.

Hope this helps.

Answer 2

Answer:

In triangle or if r= 90° sin Q=1/2 then 3 cos q - 4 cos cube Q is equal is

answer is :-  0

Step-by-step explanation:

In Pythagoras theorem:

The statement of Pythagoras theorem is , in the right triangle the square of hypotenuse is equal to the sum of square of perpendicular and square of base

Formula is as follows:

(hypo)² = (perp)² + (base)²

given:  sin Q= 1/2

sin Q = (perp)/(hypo)

Cos Q =  (base)/(hypo)

sin Q = 1/2

(i.e., sin 30° = 1/2)

Q = 30°

Since, 3 cos 30° - 4 cos³ 30°                                       (i.e., cos 30° = √3/2)

= 3 x √3/2 - 4 (√3/2)³

= 3√3/2 - 12√3/8

= 3√3/2-3√3/2

= 0

Hence , the solution of the 3 cos 30° - 4 cos³ 30° is 0

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