Question

Evaluate the product of tan45 tan65 tan85 tan5 tan25 without the use of logarithm tablr

Answer 1

Step-by-step explanation:

i have written in the above picture

2sin(c)sin(d)=cos(c-d)+cos(c+d)

2cos(c)cos(d)=cos(c+d)+cos(c-d)

tan45=1

cos90=0