Question

Prove LHS=RHS
sin85∘+sin80∘+sin210∘+sin25∘=2​

Answer 1

Answer:

2 answer is correct

Step-by-step explanation:

please make me brain list please

Answer 2

Answer:

Step-by-step explanation:

sin25∘+sin210∘+sin215∘+...+sin285∘+sin290∘  

=sin2(90−85)∘+sin2(90−80)∘+sin2(90−75)∘+...sin275∘+sin280∘+sin285∘+sin290∘

=cos285∘+cos280∘+cos275∘+...+sin245∘+...+sin275∘+sin280∘+sin285∘+sin290∘

=(cos285∘+sin285∘)+(cos280∘+sin280∘)+...(cos240∘+sin240∘))+sin245∘+sin290∘

=1+1+1+1+1+1+1+1+12+1

=9.5

∴sin25∘+sin210∘+sin215∘+...+sin285∘+sin290∘=9.5

2 is correct answer pls make me as  brainlist