Question

if cosA=0.2 find sin3A​

Answer 1

Answer:

Kindly check the question

Step-by-step explanation:

Assuming cos A = 0.5

cos a = 1/2

a= 60°

sin 3a = 3sin* √3/2

=1.732*3/2

=2.598

Answer 2

Answer:

cos A = 0.2

Sin A =

$\sqrt{1 - 0.2 {}^{2} }$

=

$\sqrt{1 - 0.04} \\ = \sqrt{0.96} = 0.98$

$sin \: 3x = 3sin \: x - 4sin {}^{3} x$

put the value of sinx and solve