Write an expression for cos 68° using sine

The expression for cos 68° can write in sine using co function identity.

The expression for cos 68° using sine can written as sin 22° .

Given

The given expression is cos 68°.

Using co function identity write the expression.

Substitute 68° for .

Thus, the expression for cos 68° using sine can written as sin 22° .

Learn more about co function identity here:

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sin22°

Step-by-step explanation:

Using the cofunction identity

cos x = sin (90 - x), then

cos68° = sin(90 - 68)° = sin22°

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.

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step-by-step explanation: