Math, asked by viyaskhan2002, 6 months ago

the value of 4cos^3 40°-3cos40°

Answers

Answered by sureshhm

0

Answers : (1)

Using the Trigonometric Identiyu: Cos 3x= 4cos3x-3cosx

Now given : 4 cos3 40 -3sin50 = 4 cos3 40 – 3 sin (90-40)= 4 cos 3 40- 3 cos40 = cos3.40= cos 120= cos(90+30)=-sin30=-1/2

Ans: -1/2

Step-by-step explanation:

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