Four Fifths of the total number of students take the school bus to school.
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When we need the cosine of the sum of two angles, we use the addition formula for cosine.
When we need the sine of the difference of two angles, we use the difference formula for sine.
Let's try one. Say we needed to know
We're only expected to know the trig functions of 30/60/90 and 45/45/90 triangles. Fortunately,
so
When we need the sine of the difference of two angles, we use the difference formula for sine.
Let's try one. Say we needed to know
We're only expected to know the trig functions of 30/60/90 and 45/45/90 triangles. Fortunately,