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Math Help - :S need help

  1. #1
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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
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  2. #2
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    e^(i*pi)'s Avatar
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    Quote Originally Posted by Greener View Post
    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
    Yeah, that's all there is to it at GCSE

    Later on you should cover radians and other trig functions and the special triangles
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  3. #3
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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.
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  4. #4
    Senior Member pacman's Avatar
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    "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
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  5. #5
    Senior Member pacman's Avatar
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    sin^-1 is arcsin or in the calculator inv sin or shift sin, i am glad you know it now how to use it
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