Question

if 2cos 3A= ✓3 and A is acute , find: sin a cos 2A sin^(75°-A) + cos^(45°+A)​

Answer 1

Answer:

Given that 2cos2A=

3

So,

cos2A=

2

3

cos2A=cos30

∘

2A=30

∘

A=15

∘

It is also given that sin3A=

m

1

So,

sin3×15

∘

=

m

1

sin45

∘

=

m

1

2

1

=

m

1

Hence, m=2

Answer 2

$hope \: it \: helps \: you$