cos 135°- cos 120°/cos 135° + cos 120°= 3-2√2......prove it
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cos135=-cos45=-√2/2
cos120=-cos60=-½
LHS
=-½(√2–1)/-½(√2+1)
=(√2–1)²/(2–1)
=(2+1–2√2)/1
=3–2√2
this may help u.....
cos120=-cos60=-½
LHS
=-½(√2–1)/-½(√2+1)
=(√2–1)²/(2–1)
=(2+1–2√2)/1
=3–2√2
this may help u.....
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