Q. 2

# Choose the correc

Answer :

We need to find the value of Let,  Let us find sin a and cos b.

For sin a,

We know the trigonometric identity, sin2 a + cos2 a = 1

sin2 a = 1 – cos2 a

sin a = √(1 – cos2 a)

Substituting the value of cos a,     We have .

So, we can find tan a.   tan a = 7 …(i)

For cos b,

We know the trigonometric identity,

sin2 b + cos2 b = 1

cos2 b = 1 – sin2 b

cos b = √(1 – sin2 b)

Substituting the value of sin b,    We have .

So, we can find tan b.   tan b = 4 …(ii)

We can write as, Now, we need to solve Right Hand Side (RHS).

We know the trigonometric identity, Substituting the values of tan a and tan b from (i) and (ii),   So, Rate this question :

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