Question

$\huge\fbox \red{h}\fbox \green{e}\fbox \purple{l}\fbox \orange{l}\fbox \red{o}$



Evaluate: sin2 19° + sin771°.



➠ REQUIRED GOOD ANSWER​

Answer 1

$\huge \colorbox{pink}{❥ᴀ᭄ɴsᴡᴇʀ}$

sin2 19° + sin2 71°

⟹ sin219° + sin2 (90° – 19°)…[∵ sin(90° – θ) = cos θ

⟹ sin2 19° + cos2 19° = 1 …[∵ sin2 θ + cos2 θ = 1 REQUIRED ANSWER

Answer 2

❥ᴀ᭄ɴsᴡᴇʀ

sin2 19° + sin2 71°

⟹ sin219° + sin2 (90° – 19°)…[∵ sin(90° – θ) = cos θ

⟹ sin2 19° + cos2 19° = 1 …[∵ sin2 θ + cos2 θ = 1 REQUIRED ANSWER

♡