Question

(iv) sin² 135° + cos² 120° - sin 120° + tan² 150°=1/3 proved
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Answer 1

Answer:

hence  not proved.

Step-by-step explanation:

step1) sin^2 135=sin(90+45)^2=cos^245=1/2

step2)cos^2 120= cos(90+30)^2=cos^230=3/4

step3) -sin^2 120=sin(90+30)^2=-cos^230=-3/4

step4) tan^2 150=tan(90+60)^2=-cot^260=-1/3

step 5) now add all these products -3/4 and 3/4 are canceled.

∴HENCE THE ANSWER IS 5/6

HOPE IT WILL HELP YOU