Question

i want full solution very important plz rply fast who know the answer​

Answer 1

Step-by-step explanation:

tanθ=1

tanθ=tan45°

θ=45°

sin phy=1/√2

sin phy=sin45°

phy=45

cos(θ+phy)=cosθcos phy -sinθsin phy

=cos45cos45-sin45sin45

=1/√2.1/√2-1/√2.1/√2

=0

or

cos(θ+phy)=cos(45+45)

=cos90

=0