Question

sin 5° cos 85° + cos 5° sin 85°.
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Answer 1

Answer:

1

Step-by-step explanation:

given,

sin5 cos 85 + cos 5 sin 85

sin (90- 85) cos 85 + cos (90-85) sin 85

cos2 85 + Sin2 85

1

Answer 2

Step-by-step explanation:

• sin 5 × cos 85 + cos 5 ×sin 85
• sin(90-85) cos 85 + cos(90-85) sin 85
• cos 85 cos 85 + sin 85 sin 85

${cos}^{2} 85 + {sin}^{2} 85 = 1$

${ \sin }^{2} + { \cos}^{2} = 1$

so answer is 1