Question

if sin A=1/2 then show that 3 cos A minus 4 cos A=0​

Answer 1

Step-by-step explanation:

hey dear I think there is some mistakes in ur question because in my book this question is also given but the question is if sin A=1/2 then show that 3 cos A minus 4 cos³ A=0

Answer 2

Answer:

♊CORRECT YOUR QUESTION MATE♊

GIVEN SINA =1/2

PROVE THAT 3COSA - 4COSA³=0

SINA=1/2

THEREFORE SIN30°=1/2

SO....

SINA=SIN30°

A=30°

PROVING THAT........ 3COSA-4COSA³=0

TAKING A =30°

3(COS30°) -4(COS30°) ³

COS30°=√3/2

3(√3/2) -4(√3/2) ³

3×√3/2-4×√3/8

3√3/2-3√3/2=0

HENCE PROVED✔