RonnyDeKoning
How do i start with this?



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RonnyDeKoning
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dw:1353243606008:dw

UnkleRhaukus
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\[2\cdot\sin^2(22.5°)7\]?

RonnyDeKoning
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I have to use halving formulas.

RonnyDeKoning
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Or doubling, I don't know

sauravshakya
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HINT:dw:1353244003286:dw

sauravshakya
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dw:1353244089060:dwSo,

sauravshakya
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Now, can u?

RonnyDeKoning
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Hmm, this is the sample answer, but i don't get it:dw:1353244153625:dw

sauravshakya
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dw:1353244390655:dw

RonnyDeKoning
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dw:1353244542535:dw
What step do you use here?

RonnyDeKoning
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dw:1353244580109:dw

sauravshakya
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dw:1353244997053:dwI used

RonnyDeKoning
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What kind of formula is that?

RonnyDeKoning
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It's a doubling formula right?

sauravshakya
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dw:1353245573421:dw

RonnyDeKoning
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Is there a patron to slove these kind of ex?

hba
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pattern*,solve*