Question

show that sin35/cos55 whole square -2cos square 60=1/2​

Answer 1

Answer:

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Answer 2

Answer:

Step-by-step explanation:

show that (sin35/cos55)^2-2cos^2 60=1/2

LHS:

(sin35/cos55)^2-2cos^2 60....(1)

we know that sinx=cos(90-x)

that is sin 35=cos(90-35)=cos55

so sin35/cos55=1...(2)

And cos 60=1/2

squaring on both sides

cos^2(60)=1/4

2*cos^2(60)=2*1/4=1/2...(3)

substitute (2) and (3) in (1)

we get

1-1/2=1/2=RHS