Trigonometry

[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]

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)

wats the '?'.........

[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)

wats the '?'.........

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 ...

[nid404]

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

yup it's correct now
Can you answer it master786??

[Ghost Of Highbury]

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)

is it 4cos²x and 3sin²x...or 2x

[master786]

i wil ltry

lost touch with identities .. is this C2 stuff ?
or higher ?

[nid404]

i wil ltry

lost touch with identities .. is this C2 stuff ?
or higher ?

It's an AS question Pure maths

[master786]

oh great lets wait for astar
he wil answer it in no time

[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)

is it 4cos²x and 3sin²x...or 2x

2x not superscript

haha master786 i knew astar could do it

[master786]

yea i hav done identities but inedexcel...C2 ..theC3 once might be the level of pure maths ... nd C3 i havent done yet
so yea astars the man now

[nid404]

yea i hav done identities but inedexcel...C2 ..theC3 once might be the level of pure maths ... nd C3 i havent done yet
so yea astars the man now

no problem master...i can wait

[Ghost Of Highbury]

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)

done
answer in the next post

[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)

done
answer in the next post

Thanks adi...