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**niharika_kumar****Member**- From: Numeraland
- Registered: 2013-02-12
- Posts: 1,062

If

is acute and , then find the value ofoptions are:-

A)

B)

C)

D)

*Last edited by niharika_kumar (2014-01-25 21:06:28)*

friendship is tan 90°.

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**bob bundy****Administrator**- Registered: 2010-06-20
- Posts: 8,497

hi Niharika

You can use these trig formulas:

and

But first you'll need cos beta

Oh yes , and one more thing ... x5 and /5 so that you make fractions thus: 3/5 and 4/5.

Bob

Now to look at the second one.

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Sometimes I deliberately make mistakes, just to test you! …………….Bob Bundy

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