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Hint

Symbol needed: θ a = α b = β

1

sin²(θ)+cos²(θ)=

1

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2

tan²(θ)+1=

sec²(θ)

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3

tan²(θ)=

sec²(θ)-1

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4

sin(a+b)=

sin(a)cos(b)+cos(a)sin(b)

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5

cos(a+b)=

cos(a)cos(b)-sin(a)sin(b)

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6

sin(2a)=

2sin(a)cos(a)

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7

cos(2a)=

cos²(a)-sin²(a)

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8

sin²(θ)=

1/2(1-cos(2θ))

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9

cos²(θ)=

1/2(1+cos(2θ))

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