Question

if 2sinalpha =1 find the value of 3cosalpha - 4cos3alpha​

Answer 1

Answer:

0

Step-by-step explanation:

2sin alpha = 1

sin alpha = 1/2

sin alpha = sin 30°

alpha = 30°

therefore 4cos3alpha

= 4cos 3×30°

= 4cos 90°

= 4×0

=0

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