If cos9A = sinA and 9A < 90*, then the value of tan 5A is

Asked by  | 29th Sep, 2012, 10:14: PM

Expert Answer:

9A < 90* means A < 10*.

A < 10* means A < 90*.

For X between 0* to 90*, the values of sin X are different.

 

So, A = 9A

That is 8A = 0

So, A = 0*.

Now, 5A = 5 × 0* = 0*.

 

Hence, tan 5A = tan 0* = 0.

Answered by  | 29th Sep, 2012, 10:27: PM

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