Question

:) Please answer. (Basic trigonometry)

Answer 1

Answer:

Step-by-step explanation:

as we know sin ²85= cos ²5

then sin²5+cos²5=1

similarly for 10,80

15,75

20,70

25,65

30,60

35,55

40,50

and they are eight

and sin²45=1/2

and sin²90 =1

so the sum is

8+1+1/2

9+1/2

18+1/2

=19/2

which is also equal to

9¹₂

Answer 2

Answer attached...

Hope it helped u☺️