Question

4 2 COS (0) + cos² (0)sin²(0)+ sin² (0)/ cos²(0)+ cos² (0) sin² (0) + sin^4(0)​

Answer 1

Answer:

sin

2

10

π

+sin

2

10

4π

+sin

2

10

6π

+sin

2

10

9π

=sin

2

18

∘

+sin

2

72

∘

+sin

2

108

∘

+sin

2

162

∘

=sin

2

18

∘

+sin

2

(90

∘

−18

∘

)+sin

2

(90

∘

+18

∘

)+sin

2

(180

∘

−18

∘

)

=sin

2

18

∘

+cos

2

18

∘

+cos

2

18

∘

+sin

2

18

∘

=2sin

2

18

∘

+2cos

2

18

∘

=2(sin

2

18

∘

+cos

2

18

∘

)

=2×1

=2