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nid404:
Express 8 sin theta-15 cos theta in the form R sin(theta-alpha), where R > 0 and 0degress < alpha < 90degrees, giving the
exact value of R and the value of alpha correct to 2 decimal places.

Can somebody help me with this....plz guide me with the steps..astar plz help

nid404:
one more identity question...it's a little complicated for me to understand
Prove the identity
(cos x + 3 sinx)2 = 5 - 4cos2x + 3 sin2x.

Sir, can u list all the equations we need to know for AS trig...i mean equations relating the three functions (tan,sin and cos)

Ghost Of Highbury:

--- Quote from: nid404 on September 08, 2009, 04:54:43 am ---one more identity question...it's a little complicated for me to understand
Prove the identity
(cos x + 3 sinx)2 ? 5 ? 4cos2x + 3 sin2x.

Sir, can u list all the equations we need to know for AS trig...i mean equations relating the three functions (tan,sin and cos)


--- End quote ---
wats the '?'.........

nid404:

--- Quote from: eddie_adi619 on September 08, 2009, 05:53:40 am ---
--- Quote from: nid404 on September 08, 2009, 04:54:43 am ---one more identity question...it's a little complicated for me to understand
Prove the identity
(cos x + 3 sinx)2 ? 5 ? 4cos2x + 3 sin2x.

Sir, can u list all the equations we need to know for AS trig...i mean equations relating the three functions (tan,sin and cos)


--- End quote ---
wats the '?'.........

--- End quote ---
oopss....when i copy pasted it...the symbol changed...anyways i've corrected it

master786:
ur question can u clear it nd post ...
i cant get the question properly ... the second tht is ...

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