Question

cos9B=sinB and B<10° . what's the value of cot5B ?​

Answer 1

Answer:

b=10°

Step-by-step explanation:

cos9b=sinB

by using cos,{90-b} sinB

so cos {99b}=sin (90-9B)

so,sin{90-9b}=sinB

so,90-9b=b,

b=10°