Question

evaluate cos75°/sin15°+SIN12°/COS78°-cos18°/sin72°

Answer 1

cos 75= sin(90-75)= sin 15
similarly,

sin 12=cos 78
cos 18=sin 72

puting the value,

1+1-1
2-1
1

Answer 2

Answer:

1

Step-by-step explanation:

cos75/sin15+sin12/cos78-cos18/sin72

cos(90-75)/sin15+sin(90-12)/cos78-cos(90-18)/sin72

sin15/sin15+cos78/cos78-sin72/sin72

1+1-1

2-1

1

ans:- 1