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Samarpit

· started a discussion

· 1 Months ago

Option D is also right (Question: 382362.0 )

If we take x=y=45 &z=90 we get option D as right answer

Question:

If x + y = z, find the value of cos2x + cos2y + cos2z.

Options:
A)

1 + 2sinx siny sinz

B)

1 – 2sinx siny sinz

C)

1 + 2cosx cosy cosz

D)

1 – 2cosx cosy cosz

Solution:

Ans: (c)

  

Jatt

· commented

· 1 Months ago

If we put above value then C&Dboth right ...again check with x=y=z=0
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