cos 135 - cos 120/
cos 135° + cos 120°
=(3-2√2)
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Step-by-step explanation:
cos { 90 + 45 } - cos { 90+30} ÷ cos {90+45} + cos
{90+30}
={ - 1/√2 - 1/2 }/ -1/√2 + 1/2
= 【-2 - √2 】/ -2 + √2
Answered by
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