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Nagesh siva

· started a discussion

· 1 Months ago

I need detailed explanation (Question: 451930.0 )

I think some explanation is missing

Question:

If sinA, cosA and tan A are in GP, then cos3A + cos2A =?

Options:
A) 1
B) 2
C) 3
D) 4
Solution:

Ans.(a) 

sinA, cosA  and  tanA are in G.P. 

Then, cos2 A = sinA. tanA

cos2A = sin2 A/cos A------------eq(1)

cos3A = sin2 A = 1 –  cos2 A-----------eq(2)

By simplifying eq(1) and (2)

\(\therefore\) cos3 A + cos2 A = 1

Knowledge Expert

· commented

· 1 Months ago

Dear student
We have updated the solution,
please solve again .

Keep learning
Team TR

Knowledge Expert

· commented

· 1 Months ago

Yet to be approved!
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