Question

Evaluate :
sin63° + sin? 27°/
COS? 17° + cos2 73°
​

Answer 1

Answer:

Step-by-step explanation:

• sin²63°+sin²73°÷cos² 17+cos²73°
• sin²(90-27)+sin² 27°÷cos²(90-73) + cos² 73°
• cos² 27° + sin² 27°÷sin² 73°+cos²73

• 1÷1
• 1

we know that

63+27=90

Hence,

63=90-27

Similarly

17+73=90

Hence,

17=90-73

cos(90-α) = sinα

& sin(90-α) =cosα

as

cos²A+sin²A=1