prove that sin^2 30+2tan^2 60- 5 cos^2 45 = 17/4
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Answer:
L.H.S= sin^2 30+2tan^2 60-5cos^2 45
= (1÷2)^2+2×(√3)^2 - 5(1÷√2)^2
= 1÷4 +2×3 -5×1÷2
= 1÷4+ 6 - 5÷2
= (1+24-10)÷4
= 15/4
hence, it's 15/4 not 17/4
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