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- Sep 19th 2009, 06:52 AM #1

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- Sep 2009
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## :S need help

is this really that easy?

I have a few questions on homework (GCSE level) and it all seems very easy.

1) sin 28 = is it really that simple that you type in sin 28 into the calulator? so in this case sin = 0.469?

2) 6/ tan 40 = yet again do you just type that into cal? 7.15 in this case?

3) when knowing sine, cosine or tangent, and the question asks to find the angle, is it simply sin/cos/tan -1 (E.g0.3) ? E.g sin-1(0.5) angle would = 30 in this exp?

Need help all seems extremly easy :S

TY

- Sep 19th 2009, 06:53 AM #2

- Sep 19th 2009, 06:59 AM #3

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- Sep 2009
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tyvm

Im doing AS physics at college and there summing up GCSE maths for it for some reason and i just couldnt belive it would be so simple. I remeber hating it last year and finding it so hard. plus side tho..... i did the sin -1(0.345) thingy in a physics test as a random guess for about 9 questions glad i got them right then.

thanks again.

- Sep 19th 2009, 07:35 AM #4
"1) sin 28 = is it really that simple that you type in sin 28 into the calulator? so in this case sin = 0.469?

2) 6/ tan 40 = yet again do you just type that into cal? 7.15 in this case?"

calculator keys vary from calculator to calculator;

**1)**a) type**SIN**key then**28**

b) type [**INV**or**SHIFT**] and**SIN**in succession, then type**0.469**

2) 6/tan 40 = 7.15

type [**INV**or**SHIFT**] and**TAN**in succession, then type**7.15**

- Sep 19th 2009, 07:38 AM #5