Math Is Fun Forum

niharika_kumar

Member

From: Numeraland

Registered: 2013-02-12

Posts: 1,062

trigonometry#1

If     

is acute and

, then find the value of

options are:-
A)

B)

C)

D)

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

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Bob

Administrator

Registered: 2010-06-20

Posts: 10,643

Re: trigonometry#1

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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