Question

if tan a=tanb=1 then find cosacosb-sinasinb

Answer 1

Answer:

' 0 ' is answer

Step-by-step explanation:

$tana=1 \\\\=>\frac{sina}{cosa}=1\\\\ =>sina=cosa\\\\tanb=1\\\\=>\frac{sinb}{cosb}=1\\\\ =>sinb=cosb$

Now sub. cos a and cos b values in sin a and sin b.

$So,\\\\=>cosa.cosb-sina.sinb\\\\=>cosa.cosb-cosa.cosb\\\\=>0$

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