Question

in triangle ABC right angle at A if cotB=1

find values of

[i] cosB cosC + sinB sinC

[ii] sinB cosC - cosB sinC

Answer 1

1) cosB cosC + sinB sinC
Ans. = 1
2) sinB cosC - cosB sinC
Ans= 0

Answer 2

Answer:

Step-by-step explanation:

(1) answer is 1

(2) answer is 0