Q. 7 A3.9( 66 Votes )

Given <span lang=

Answer :

We have been given that,


 


And we have to solve for .


We know the formula: (x + y)(x – y) = x2 – y2


Using this,



Also, we know the relationship between cos θ and sin θ which is given by


cos2 θ + sin2 θ = 1


cos2 θ = 1 – sin2 θ


So,


   

As we know,



So, B = 7 and P = 8

By Pythagoras theorem,

H2 = P2 + B2
H2 = 82 + 72
     = 64 + 49
=113

H = √113

As we know,



So,



Now,








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