Question

Assume sin(θ)=19/36 where π2<θ<π, and cos(ϕ)=−11/38 where π<ϕ<3π/2. Use sum or difference formula to compute: sin(θ...

Assume sin(θ)=19/36 where π2<θ<π, and cos(ϕ)=−11/38 where π<ϕ<3π/2. Use sum or difference formula to compute:

sin(θ +ϕ)=

sin(θ -ϕ)=

cos(θ +ϕ)

cos(θ -ϕ)=

Math   Precalculus   
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Answer #1

in this problem we use two angle sum up formula for cosine and sine

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