Question

if cos9theta=sintheta and 9theta <90,find the value of tan 5theta​

Answer 1

Answer:1

Step-by-step explanation:

cos 9 theta = sin theta

sin ( 90 - 9theta ) = sin theta

90 - 9 theta = theta

theta = 9

now tan 5 theta  = tan 5 x 9 = tan 45 = 1

Answer 2

Answer:1

Step-by-step explanation:

Cos9A =sinA

cos9A=sin(90-A)

cos9A=cos(90-A)

9A=90-A

10A=90

A=9

tan5A=tan5(9)=tan45=1