Question

$if \: \: \tan( \frac{3}{4} ) then \: \: {cos}^{2} a - {sin}^{2} a \: \: =$
step by step........​

Answer 1

Step-by-step explanation:

2tan30°

⇢

1−(

3

1

)

2

2×

3

1

⇢

1−

3

1

3

2

⇢

3

3−1

3

×

3

2×

3

⇢

3

2

3

2

3

⇢

2

2

3

⇢

3

We know that √3 = tan60°

\large\tt\ \frac{2 \: tan30°}{1 - {tan}^{2}30° } = \tan60°

1−tan

2

30°

2tan30°

=tan60°